ofz#9591 Indirect-leak

==18428== 12,809 (176 direct, 12,633 indirect) bytes in 1 blocks are definitely lost in loss record 2,664 of 2,683
==18428==    at 0x4C2EBAB: malloc (vg_replace_malloc.c:299)
==18428==    by 0x8D1CBC8: xmlNewDoc (tree.c:1171)
==18428==    by 0x8D0C43D: xmlParseEntityDecl (parser.c:5521)
==18428==    by 0x8D0F017: xmlParseMarkupDecl (parser.c:6802)
==18428==    by 0x8D11588: xmlParseInternalSubset (parser.c:8305)
==18428==    by 0x8D1733A: xmlParseTryOrFinish (parser.c:11977)
==18428==    by 0x8D17DDA: xmlParseChunk (parser.c:12263)
==18428==    by 0x3060C380: sax_fastparser::FastSaxParserImpl::parse() (fastparser.cxx:1041)
==18428==    by 0x3060B6DC: sax_fastparser::FastSaxParserImpl::parseStream(com::sun::star::xml::sax::InputSource const&) (fastparser.cxx:850)
==18428==    by 0x3060E675: sax_fastparser::FastSaxParser::parseStream(com::sun::star::xml::sax::InputSource const&) (fastparser.cxx:1357)
==18428==    by 0x2F4B2ABE: SvXMLImport::parseStream(com::sun::star::xml::sax::InputSource const&) (xmlimp.cxx:485)
==18428==    by 0x34E2C12C: filter::odfflatxml::OdfFlatXml::importer(com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> const&, com::sun::star::uno::Reference<com::sun::star::xml::sax::XDocumentHandler> const&, com::sun::star::uno::Sequence<rtl::OUString> const&) (OdfFlatXml.cxx:150)

Change-Id: I63885b837e7311330255457da3a368bd3f4f8921
Reviewed-on: https://gerrit.libreoffice.org/58933
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

sax/source/fastparser/fastparser.cxx

@@ -752,8 +752,12 @@ namespace
         }
         ~ParserCleanup()
         {
-            //xmlFreeParserCtxt accepts a null arg
-            xmlFreeParserCtxt(m_rEntity.mpParser);
+            if (m_rEntity.mpParser)
+            {
+                if (m_rEntity.mpParser->myDoc)
+                    xmlFreeDoc(m_rEntity.mpParser->myDoc);
+                xmlFreeParserCtxt(m_rEntity.mpParser);
+            }
             m_rParser.popEntity();
         }
     };