Fix memory leak in parser error path

Triggered in mixed content ELEMENT declarations if there's an invalid
name after the first valid name:

    <!ELEMENT para (#PCDATA|a|<invalid>)*>

Found with libFuzzer and ASan.
1 file changed
tree: 859a8be3f0fc2f151e7a878b2dbc90510868c4e6
  1. bakefile/
  2. doc/
  3. example/
  4. include/
  5. macos/
  6. optim/
  7. os400/
  8. python/
  9. result/
  10. test/
  11. vms/
  12. VxWorks/
  13. win32/
  14. xstc/
  15. .gitignore
  16. acinclude.m4
  17. AUTHORS
  18. autogen.sh
  19. buf.c
  20. buf.h
  21. build_glob.py
  22. c14n.c
  23. catalog.c
  24. ChangeLog
  25. check-relaxng-test-suite.py
  26. check-relaxng-test-suite2.py
  27. check-xinclude-test-suite.py
  28. check-xml-test-suite.py
  29. check-xsddata-test-suite.py
  30. chvalid.c
  31. chvalid.def
  32. configure.ac
  33. Copyright
  34. dbgen.pl
  35. dbgenattr.pl
  36. debugXML.c
  37. dict.c
  38. DOCBparser.c
  39. elfgcchack.h
  40. enc.h
  41. encoding.c
  42. entities.c
  43. error.c
  44. genChRanges.py
  45. gentest.py
  46. genUnicode.py
  47. global.data
  48. globals.c
  49. HACKING
  50. hash.c
  51. HTMLparser.c
  52. HTMLtree.c
  53. INSTALL.libxml2
  54. legacy.c
  55. libxml-2.0-uninstalled.pc.in
  56. libxml-2.0.pc.in
  57. libxml.3
  58. libxml.h
  59. libxml.m4
  60. libxml.spec.in
  61. libxml2-config.cmake.in
  62. libxml2.doap
  63. libxml2.syms
  64. list.c
  65. MAINTAINERS
  66. Makefile.am
  67. Makefile.tests
  68. Makefile.win
  69. nanoftp.c
  70. nanohttp.c
  71. NEWS
  72. parser.c
  73. parserInternals.c
  74. pattern.c
  75. README
  76. README.cvs-commits
  77. README.tests
  78. regressions.py
  79. regressions.xml
  80. relaxng.c
  81. rngparser.c
  82. runsuite.c
  83. runtest.c
  84. runxmlconf.c
  85. save.h
  86. SAX.c
  87. SAX2.c
  88. schematron.c
  89. testapi.c
  90. testAutomata.c
  91. testC14N.c
  92. testchar.c
  93. testdict.c
  94. testdso.c
  95. testHTML.c
  96. testlimits.c
  97. testModule.c
  98. testOOM.c
  99. testOOMlib.c
  100. testOOMlib.h
  101. testReader.c
  102. testrecurse.c
  103. testRegexp.c
  104. testRelax.c
  105. testSAX.c
  106. testSchemas.c
  107. testThreads.c
  108. testThreadsWin32.c
  109. testURI.c
  110. testXPath.c
  111. threads.c
  112. timsort.h
  113. TODO
  114. TODO_SCHEMAS
  115. tree.c
  116. trio.c
  117. trio.h
  118. triodef.h
  119. trionan.c
  120. trionan.h
  121. triop.h
  122. triostr.c
  123. triostr.h
  124. uri.c
  125. valid.c
  126. xinclude.c
  127. xlink.c
  128. xml2-config.1
  129. xml2-config.in
  130. xml2Conf.sh.in
  131. xmlcatalog.c
  132. xmlIO.c
  133. xmllint.c
  134. xmlmemory.c
  135. xmlmodule.c
  136. xmlreader.c
  137. xmlregexp.c
  138. xmlsave.c
  139. xmlschemas.c
  140. xmlschemastypes.c
  141. xmlstring.c
  142. xmlunicode.c
  143. xmlwriter.c
  144. xpath.c
  145. xpointer.c
  146. xzlib.c
  147. xzlib.h