sch_prio: Use NET_XMIT_SUCCESS instead of "0" constant.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sched/sch_prio.c b/net/sched/sch_prio.c
index 7cdc3e6..a6697c6 100644
--- a/net/sched/sch_prio.c
+++ b/net/sched/sch_prio.c
@@ -113,7 +113,7 @@
 	if ((ret = qdisc->ops->requeue(skb, qdisc)) == NET_XMIT_SUCCESS) {
 		sch->q.qlen++;
 		sch->qstats.requeues++;
-		return 0;
+		return NET_XMIT_SUCCESS;
 	}
 	if (net_xmit_drop_count(ret))
 		sch->qstats.drops++;