net_sched: check NULL on error path in route4_change()

On error path in route4_change(), 'f' could be NULL,
so we should check NULL before calling tcf_exts_destroy().

Fixes: b9a24bb ("net_sched: properly handle failure case of tcf_exts_init()")
Reported-by: kbuild test robot <[email protected]>
Cc: Jamal Hadi Salim <[email protected]>
Signed-off-by: Cong Wang <[email protected]>
Acked-by: Jamal Hadi Salim <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: congwang

net/sched/cls_route.c

@@ -559,7 +559,8 @@ static int route4_change(struct net *net, struct sk_buff *in_skb,
 	return 0;
 
 errout:
-	tcf_exts_destroy(&f->exts);
+	if (f)
+		tcf_exts_destroy(&f->exts);
 	kfree(f);
 	return err;
 }