net_sched: Improve readability of filter processing

Signed-off-by: Jamal Hadi Salim <jhs@mojatatu.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sched/sch_api.c

@@ -1841,7 +1841,7 @@ int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp,
 			return err;
 	}
 
-	return -1;
+	return TC_ACT_UNSPEC; /* signal: continue lookup */
 #ifdef CONFIG_NET_CLS_ACT
 reset:
 	if (unlikely(limit++ >= MAX_REC_LOOP)) {