cls_flower: Fix incorrect idr release when failing to modify rule

When we fail to modify a rule, we incorrectly release the idr handle
of the unmodified old rule.

Fix that by checking if we need to release it.

Fixes: fe2502e ("net_sched: remove cls_flower idr on failure")
Reported-by: Vlad Buslov <[email protected]>
Reviewed-by: Roi Dayan <[email protected]>
Acked-by: Jiri Pirko <[email protected]>
Signed-off-by: Paul Blakey <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: Paul Blakey

net/sched/cls_flower.c

@@ -977,7 +977,7 @@ static int fl_change(struct net *net, struct sk_buff *in_skb,
 	return 0;
 
 errout_idr:
-	if (fnew->handle)
+	if (!fold)
 		idr_remove(&head->handle_idr, fnew->handle);
 errout:
 	tcf_exts_destroy(&fnew->exts);