net: sched: cls_matchall: no need to call tcf_exts_change for newly allocated struct

As the head struct was allocated right before mall_set_parms call,
no need to use tcf_exts_change to do atomic change, and we can just
fill-up the unused exts struct directly by tcf_exts_validate.
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sched/cls_matchall.c

@@ -120,27 +120,17 @@ static int mall_set_parms(struct net *net, struct tcf_proto *tp,
 			  unsigned long base, struct nlattr **tb,
 			  struct nlattr *est, bool ovr)
 {
-	struct tcf_exts e;
 	int err;
 
-	err = tcf_exts_init(&e, TCA_MATCHALL_ACT, 0);
-	if (err)
-		return err;
-	err = tcf_exts_validate(net, tp, tb, est, &e, ovr);
+	err = tcf_exts_validate(net, tp, tb, est, &head->exts, ovr);
 	if (err < 0)
-		goto errout;
+		return err;
 
 	if (tb[TCA_MATCHALL_CLASSID]) {
 		head->res.classid = nla_get_u32(tb[TCA_MATCHALL_CLASSID]);
 		tcf_bind_filter(tp, &head->res, base);
 	}
-
-	tcf_exts_change(tp, &head->exts, &e);
-
 	return 0;
-errout:
-	tcf_exts_destroy(&e);
-	return err;
 }
 
 static int mall_change(struct net *net, struct sk_buff *in_skb,