[PATCH] fix skb leak

This reverts a broken part of the recent "Consolidate skb delivery" patch. 

It was doing an extra increment of skb->users, causing machine death after
just a few seconds of NFS activity.

net/core/dev.c

@@ -1576,9 +1576,13 @@ int netif_receive_skb(struct sk_buff *skb)
 		}
 	}
 
-	if (pt_prev)
-		ret = deliver_skb(skb, pt_prev, 1);
-	else {
+	if (pt_prev) {
+		if (!pt_prev->data) {
+			ret = deliver_to_old_ones(pt_prev, skb, 1);
+		} else {
+			ret = pt_prev->func(skb, skb->dev, pt_prev);
+		}
+	} else {
 		kfree_skb(skb);
 		/* Jamal, now you will not able to escape explaining
 		 * me how you were going to use this. :-)