bug 338541 don't always return null from GetCurrentNode (plus, don't leak the

current node)
patch by Alex Vincent <ajvincent@gmail.com> r=bryner sr=neil a=darin

content/base/src/nsTreeWalker.cpp

@@ -161,7 +161,7 @@ nsTreeWalker::GetExpandEntityReferences(PRBool *aExpandEntityReferences)
 NS_IMETHODIMP nsTreeWalker::GetCurrentNode(nsIDOMNode * *aCurrentNode)
 {
     if (mCurrentNode) {
-        CallQueryInterface(mCurrentNode, aCurrentNode);
+        return CallQueryInterface(mCurrentNode, aCurrentNode);
     }
 
     *aCurrentNode = nsnull;