net_sched: return nla_nest_end() instead of skb->len

nla_nest_end() already has return skb->len, so replace
return skb->len with return nla_nest_end instead().

Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sched/sch_fq_codel.c b/net/sched/sch_fq_codel.c
index ba5bc92..0bf432c 100644
--- a/net/sched/sch_fq_codel.c
+++ b/net/sched/sch_fq_codel.c
@@ -450,8 +450,7 @@
 			q->flows_cnt))
 		goto nla_put_failure;
 
-	nla_nest_end(skb, opts);
-	return skb->len;
+	return nla_nest_end(skb, opts);
 
 nla_put_failure:
 	return -1;