Description:
leak on loading a specific docx

Steps to Reproduce:
1. valgrind --leak-check=full ./instdir/program/soffice.bin --headless --convert-to pdf ~/clusterfuzz-testcase-minimized-docxfuzzer-6677783406837760.docx

Actual Results:
==3842426== 
==3842426== 739,036 (48 direct, 738,988 indirect) bytes in 1 blocks are definitely lost in loss record 10,130 of 10,131
==3842426==    at 0x4845FF5: operator new(unsigned long) (vg_replace_malloc.c:422)
==3842426==    by 0x97C726C: std::__new_allocator<std::_Rb_tree_node<std::pair<rtl::OUString const, svx::diagram::Point*> > >::allocate(unsigned long, void const*) (new_allocator.h:137)
==3842426==    by 0x97C7200: std::allocator_traits<std::allocator<std::_Rb_tree_node<std::pair<rtl::OUString const, svx::diagram::Point*> > > >::allocate(std::allocator<std::_Rb_tree_node<std::pair<rtl::OUString const, svx::diagram::Point*> > >&, unsigned long) (alloc_traits.h:464)
==3842426==    by 0x97C70F1: std::_Rb_tree<rtl::OUString, std::pair<rtl::OUString const, svx::diagram::Point*>, std::_Select1st<std::pair<rtl::OUString const, svx::diagram::Point*> >, std::less<rtl::OUString>, std::allocator<std::pair<rtl::OUString const, svx::diagram::Point*> > >::_M_get_node() (stl_tree.h:561)
==3842426==    by 0x97CA4BC: std::_Rb_tree_node<std::pair<rtl::OUString const, svx::diagram::Point*> >* std::_Rb_tree<rtl::OUString, std::pair<rtl::OUString const, svx::diagram::Point*>, std::_Select1st<std::pair<rtl::OUString const, svx::diagram::Point*> >, std::less<rtl::OUString>, std::allocator<std::pair<rtl::OUString const, svx::diagram::Point*> > >::_M_create_node<std::pair<rtl::OUString, svx::diagram::Point*> >(std::pair<rtl::OUString, svx::diagram::Point*>&&) (stl_tree.h:611)
==3842426==    by 0x97CA47F: std::_Rb_tree<rtl::OUString, std::pair<rtl::OUString const, svx::diagram::Point*>, std::_Select1st<std::pair<rtl::OUString const, svx::diagram::Point*> >, std::less<rtl::OUString>, std::allocator<std::pair<rtl::OUString const, svx::diagram::Point*> > >::_Auto_node::_Auto_node<std::pair<rtl::OUString, svx::diagram::Point*> >(std::_Rb_tree<rtl::OUString, std::pair<rtl::OUString const, svx::diagram::Point*>, std::_Select1st<std::pair<rtl::OUString const, svx::diagram::Point*> >, std::less<rtl::OUString>, std::allocator<std::pair<rtl::OUString const, svx::diagram::Point*> > >&, std::pair<rtl::OUString, svx::diagram::Point*>&&) (stl_tree.h:1636)
==3842426==    by 0x97CA31E: std::_Rb_tree_iterator<std::pair<rtl::OUString const, svx::diagram::Point*> > std::_Rb_tree<rtl::OUString, std::pair<rtl::OUString const, svx::diagram::Point*>, std::_Select1st<std::pair<rtl::OUString const, svx::diagram::Point*> >, std::less<rtl::OUString>, std::allocator<std::pair<rtl::OUString const, svx::diagram::Point*> > >::_M_emplace_hint_unique<std::pair<rtl::OUString, svx::diagram::Point*> >(std::_Rb_tree_const_iterator<std::pair<rtl::OUString const, svx::diagram::Point*> >, std::pair<rtl::OUString, svx::diagram::Point*>&&) (stl_tree.h:2461)
==3842426==    by 0x97CA249: std::_Rb_tree_iterator<std::pair<rtl::OUString const, svx::diagram::Point*> > std::__cxx1998::map<rtl::OUString, svx::diagram::Point*, std::less<rtl::OUString>, std::allocator<std::pair<rtl::OUString const, svx::diagram::Point*> > >::emplace_hint<std::pair<rtl::OUString, svx::diagram::Point*> >(std::_Rb_tree_const_iterator<std::pair<rtl::OUString const, svx::diagram::Point*> >, std::pair<rtl::OUString, svx::diagram::Point*>&&) (stl_map.h:638)
==3842426==    by 0x97CA0C9: std::enable_if<is_constructible<std::pair<rtl::OUString const, svx::diagram::Point*>, std::pair<rtl::OUString, svx::diagram::Point*> >::value, std::pair<std::_Rb_tree_iterator<std::pair<rtl::OUString const, svx::diagram::Point*> >, bool> >::type std::__cxx1998::map<rtl::OUString, svx::diagram::Point*, std::less<rtl::OUString>, std::allocator<std::pair<rtl::OUString const, svx::diagram::Point*> > >::insert<std::pair<rtl::OUString, svx::diagram::Point*> >(std::pair<rtl::OUString, svx::diagram::Point*>&&) (stl_map.h:858)
==3842426==    by 0x97AA512: std::pair<__gnu_debug::_Safe_iterator<std::_Rb_tree_iterator<std::pair<rtl::OUString const, svx::diagram::Point*> >, std::__debug::map<rtl::OUString, svx::diagram::Point*, std::less<rtl::OUString>, std::allocator<std::pair<rtl::OUString const, svx::diagram::Point*> > >, std::bidirectional_iterator_tag>, bool> std::__debug::map<rtl::OUString, svx::diagram::Point*, std::less<rtl::OUString>, std::allocator<std::pair<rtl::OUString const, svx::diagram::Point*> > >::insert<std::pair<rtl::OUString, svx::diagram::Point*>, void>(std::pair<rtl::OUString, svx::diagram::Point*>&&) (map.h:285)
==3842426==    by 0x97A3D9B: svx::diagram::DiagramData::buildDiagramDataModel(bool) (datamodel.cxx:408)
==3842426==    by 0x2BBFB22F: oox::drawingml::DiagramData::buildDiagramDataModel(bool) (datamodel.cxx:450)
==3842426== 
==3842426== 1,289,078 (48 direct, 1,289,030 indirect) bytes in 1 blocks are definitely lost in loss record 10,131 of 10,131
==3842426==    at 0x4845FF5: operator new(unsigned long) (vg_replace_malloc.c:422)
==3842426==    by 0x2BC1DB2C: std::__new_allocator<std::_Rb_tree_node<std::pair<rtl::OUString const, com::sun::star::uno::Reference<com::sun::star::xml::dom::XDocument> > > >::allocate(unsigned long, void const*) (new_allocator.h:137)
==3842426==    by 0x2BC1DAC0: std::allocator_traits<std::allocator<std::_Rb_tree_node<std::pair<rtl::OUString const, com::sun::star::uno::Reference<com::sun::star::xml::dom::XDocument> > > > >::allocate(std::allocator<std::_Rb_tree_node<std::pair<rtl::OUString const, com::sun::star::uno::Reference<com::sun::star::xml::dom::XDocument> > > >&, unsigned long) (alloc_traits.h:464)
==3842426==    by 0x2BC1D9B1: std::_Rb_tree<rtl::OUString, std::pair<rtl::OUString const, com::sun::star::uno::Reference<com::sun::star::xml::dom::XDocument> >, std::_Select1st<std::pair<rtl::OUString const, com::sun::star::uno::Reference<com::sun::star::xml::dom::XDocument> > >, std::less<rtl::OUString>, std::allocator<std::pair<rtl::OUString const, com::sun::star::uno::Reference<com::sun::star::xml::dom::XDocument> > > >::_M_get_node() (stl_tree.h:561)
==3842426==    by 0x2BC1D934: std::_Rb_tree_node<std::pair<rtl::OUString const, com::sun::star::uno::Reference<com::sun::star::xml::dom::XDocument> > >* std::_Rb_tree<rtl::OUString, std::pair<rtl::OUString const, com::sun::star::uno::Reference<com::sun::star::xml::dom::XDocument> >, std::_Select1st<std::pair<rtl::OUString const, com::sun::star::uno::Reference<com::sun::star::xml::dom::XDocument> > >, std::less<rtl::OUString>, std::allocator<std::pair<rtl::OUString const, com::sun::star::uno::Reference<com::sun::star::xml::dom::XDocument> > > >::_M_create_node<std::piecewise_construct_t const&, std::tuple<rtl::OUString const&>, std::tuple<> >(std::piecewise_construct_t const&, std::tuple<rtl::OUString const&>&&, std::tuple<>&&) (stl_tree.h:611)
==3842426==    by 0x2BC1D489: std::_Rb_tree<rtl::OUString, std::pair<rtl::OUString const, com::sun::star::uno::Reference<com::sun::star::xml::dom::XDocument> >, std::_Select1st<std::pair<rtl::OUString const, com::sun::star::uno::Reference<com::sun::star::xml::dom::XDocument> > >, std::less<rtl::OUString>, std::allocator<std::pair<rtl::OUString const, com::sun::star::uno::Reference<com::sun::star::xml::dom::XDocument> > > >::_Auto_node::_Auto_node<std::piecewise_construct_t const&, std::tuple<rtl::OUString const&>, std::tuple<> >(std::_Rb_tree<rtl::OUString, std::pair<rtl::OUString const, com::sun::star::uno::Reference<com::sun::star::xml::dom::XDocument> >, std::_Select1st<std::pair<rtl::OUString const, com::sun::star::uno::Reference<com::sun::star::xml::dom::XDocument> > >, std::less<rtl::OUString>, std::allocator<std::pair<rtl::OUString const, com::sun::star::uno::Reference<com::sun::star::xml::dom::XDocument> > > >&, std::piecewise_construct_t const&, std::tuple<rtl::OUString const&>&&, std::tuple<>&&) (stl_tree.h:1636)
==3842426==    by 0x2BC1D037: std::_Rb_tree_iterator<std::pair<rtl::OUString const, com::sun::star::uno::Reference<com::sun::star::xml::dom::XDocument> > > std::_Rb_tree<rtl::OUString, std::pair<rtl::OUString const, com::sun::star::uno::Reference<com::sun::star::xml::dom::XDocument> >, std::_Select1st<std::pair<rtl::OUString const, com::sun::star::uno::Reference<com::sun::star::xml::dom::XDocument> > >, std::less<rtl::OUString>, std::allocator<std::pair<rtl::OUString const, com::sun::star::uno::Reference<com::sun::star::xml::dom::XDocument> > > >::_M_emplace_hint_unique<std::piecewise_construct_t const&, std::tuple<rtl::OUString const&>, std::tuple<> >(std::_Rb_tree_const_iterator<std::pair<rtl::OUString const, com::sun::star::uno::Reference<com::sun::star::xml::dom::XDocument> > >, std::piecewise_construct_t const&, std::tuple<rtl::OUString const&>&&, std::tuple<>&&) (stl_tree.h:2461)
==3842426==    by 0x2BC1CDC1: std::__cxx1998::map<rtl::OUString, com::sun::star::uno::Reference<com::sun::star::xml::dom::XDocument>, std::less<rtl::OUString>, std::allocator<std::pair<rtl::OUString const, com::sun::star::uno::Reference<com::sun::star::xml::dom::XDocument> > > >::operator[](rtl::OUString const&) (stl_map.h:511)
==3842426==    by 0x2BC0E8E6: oox::drawingml::importFragment(oox::core::XmlFilterBase&, com::sun::star::uno::Reference<com::sun::star::xml::dom::XDocument> const&, rtl::OUString const&, std::shared_ptr<oox::drawingml::Diagram> const&, rtl::Reference<oox::core::FragmentHandler> const&) (diagram.cxx:245)
==3842426==    by 0x2BC0D78E: oox::drawingml::loadDiagram(std::shared_ptr<oox::drawingml::Shape> const&, oox::core::XmlFilterBase&, rtl::OUString const&, rtl::OUString const&, rtl::OUString const&, rtl::OUString const&, oox::core::Relations const&) (diagram.cxx:323)
==3842426==    by 0x2BCA0B9D: oox::drawingml::DiagramGraphicDataContext::onCreateContext(int, oox::AttributeList const&) (graphicshapecontext.cxx:285)
==3842426==    by 0x2BCA1504: non-virtual thunk to oox::drawingml::DiagramGraphicDataContext::onCreateContext(int, oox::AttributeList const&) (graphicshapecontext.cxx:0)


Expected Results:
no leak


Reproducible: Always


User Profile Reset: No

Additional Info:
oss-fuzz number 48580