[libxml2] Fix a potential memory access error

[Daniel Veillard <veillard src gnome org>]

commit 0cbeb50ee03ce582a0c979c70d8fbf030e270c37
Author: Daniel Veillard <veillard redhat com>
Date:   Mon Nov 15 12:06:29 2010 +0100

    Fix a potential memory access error
    
    in case of a previus allocation error

 xpath.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/xpath.c b/xpath.c
index 4d6826d..81e33f6 100644
--- a/xpath.c
+++ b/xpath.c
@@ -3575,13 +3575,13 @@ xmlXPathNodeSetAdd(xmlNodeSetPtr cur, xmlNodePtr val) {
     } else if (cur->nodeNr == cur->nodeMax) {
         xmlNodePtr *temp;
 
-        cur->nodeMax *= 2;
-	temp = (xmlNodePtr *) xmlRealloc(cur->nodeTab, cur->nodeMax *
+	temp = (xmlNodePtr *) xmlRealloc(cur->nodeTab, cur->nodeMax * 2 *
 				      sizeof(xmlNodePtr));
 	if (temp == NULL) {
 	    xmlXPathErrMemory(NULL, "growing nodeset\n");
 	    return;
 	}
+        cur->nodeMax *= 2;
 	cur->nodeTab = temp;
     }
     if (val->type == XML_NAMESPACE_DECL) {