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.c b/net/sched/sch_fq.c
index 21e2517..23c682b 100644
--- a/net/sched/sch_fq.c
+++ b/net/sched/sch_fq.c
@@ -781,8 +781,7 @@
 	    nla_put_u32(skb, TCA_FQ_BUCKETS_LOG, q->fq_trees_log))
 		goto nla_put_failure;
 
-	nla_nest_end(skb, opts);
-	return skb->len;
+	return nla_nest_end(skb, opts);
 
 nla_put_failure:
 	return -1;