Fix freeing of nested documents

Apparently, some libxslt RVTs can contain nested document nodes, see
issue #132. I'm not sure how this happens exactly but it can cause a
segfault in xmlFreeNodeList after the changes in commit 0762c9b6.

Make sure not to touch the (nonexistent) `content` member of xmlDocs.

1 files changed, 5 insertions, 0 deletions

diff --git a/tree.c b/tree.c
index 070670f1..0d7fc98c 100644
--- a/tree.c
+++ b/tree.c
@@ -3708,6 +3708,11 @@ xmlFreeNodeList(xmlNodePtr cur) {
 		(cur->type != XML_XINCLUDE_START) &&
 		(cur->type != XML_XINCLUDE_END) &&
 		(cur->type != XML_ENTITY_REF_NODE) &&
+		(cur->type != XML_DOCUMENT_NODE) &&
+#ifdef LIBXML_DOCB_ENABLED
+		(cur->type != XML_DOCB_DOCUMENT_NODE) &&
+#endif
+		(cur->type != XML_HTML_DOCUMENT_NODE) &&
 		(cur->content != (xmlChar *) &(cur->properties))) {
 		DICT_FREE(cur->content)
 	    }