[ATM]: [br2684] if we free the skb, we should return 0

From: "Jean-Denis Boyer" <jdboyer@mediatrix.com>
Signed-off-by: NChas Williams <chas@cmf.nrl.navy.mil>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/atm/br2684.c

@@ -220,7 +220,7 @@ static int br2684_start_xmit(struct sk_buff *skb, struct net_device *dev)
 		/* netif_stop_queue(dev); */
 		dev_kfree_skb(skb);
 		read_unlock(&devs_lock);
-		return -EUNATCH;
+		return 0;
 	}
 	if (!br2684_xmit_vcc(skb, brdev, brvcc)) {
 		/*