[libxml2] Fix memory corruption when xmlParseBalancedChunkMemoryInternal is called from xmlParseBalancedChunk

[Rob Richards <rrichard src gnome org>]

commit c794eb5bb0a6c4f3d213015fa26a11e1e46a3626
Author: Rob Richards <rrichards cdatazone org>
Date:   Fri Feb 18 12:17:17 2011 -0500

    Fix memory corruption
    when xmlParseBalancedChunkMemoryInternal is called from xmlParseBalancedChunk

 parser.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/parser.c b/parser.c
index d1c7888..9ab8641 100644
--- a/parser.c
+++ b/parser.c
@@ -6992,6 +6992,7 @@ xmlParseReference(xmlParserCtxtPtr ctxt) {
 		    ent->owner = 1;
 		    while (list != NULL) {
 			list->parent = (xmlNodePtr) ent;
+			xmlSetTreeDoc(list, ent->doc);
 			if (list->next == NULL)
 			    ent->last = list;
 			list = list->next;