net_sched: fix port mirror/redirect stats reporting

When a redirected or mirrored packet is dropped by the target
device we need to record statistics.

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

net/sched/act_mirred.c

@@ -196,8 +196,7 @@ static int tcf_mirred(struct sk_buff *skb, const struct tc_action *a,
 
 	skb2->skb_iif = skb->dev->ifindex;
 	skb2->dev = dev;
-	dev_queue_xmit(skb2);
-	err = 0;
+	err = dev_queue_xmit(skb2);
 
 out:
 	if (err) {