sch_prio: Use return value from inner qdisc requeue

Use return value from inner qdisc requeue when value returned isn't
NET_XMIT_SUCCESS, instead of always returning NET_XMIT_DROP.
Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sched/sch_prio.c

@@ -117,7 +117,7 @@ prio_requeue(struct sk_buff *skb, struct Qdisc* sch)
 	}
 	if (net_xmit_drop_count(ret))
 		sch->qstats.drops++;
-	return NET_XMIT_DROP;
+	return ret;
 }