Bug 758588: Heap-based buffer overread in xmlParserPrintFileContextInternal...

Bug 758588: Heap-based buffer overread in xmlParserPrintFileContextInternal <https://bugzilla.gnome.org/show_bug.cgi?id=758588>

* parser.c:
(xmlParseEndTag2): Add bounds checks before dereferencing
ctxt->input->cur past the end of the buffer, or incrementing the
pointer past the end of the buffer.

* result/errors/758588.xml: Add test result.
* result/errors/758588.xml.err: Ditto.
* result/errors/758588.xml.str: Ditto.
* test/errors/758588.xml: Add regression test.