bonding: slight optimizztion for bond_slave_override()

When the skb is xmit by the function bond_slave_override(),
it will have duplicate judgement for slave state, and I think it
will consumes a little performance, maybe it is negligible,
so I simplify the function and remove the unwanted judgement.
Signed-off-by: NDing Tianhong <dingtianhong@huawei.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/bonding/bond_main.c

@@ -3673,28 +3673,24 @@ static inline int bond_slave_override(struct bonding *bond,
 				      struct sk_buff *skb)
 {
 	struct slave *slave = NULL;
-	struct slave *check_slave;
 	struct list_head *iter;
-	int res = 1;
 
 	if (!skb->queue_mapping)
 		return 1;
 
 	/* Find out if any slaves have the same mapping as this skb. */
-	bond_for_each_slave_rcu(bond, check_slave, iter) {
-		if (check_slave->queue_id == skb->queue_mapping) {
-			slave = check_slave;
+	bond_for_each_slave_rcu(bond, slave, iter) {
+		if (slave->queue_id == skb->queue_mapping) {
+			if (slave_can_tx(slave)) {
+				bond_dev_queue_xmit(bond, skb, slave->dev);
+				return 0;
+			}
+			/* If the slave isn't UP, use default transmit policy. */
 			break;
 		}
 	}
 
-	/* If the slave isn't UP, use default transmit policy. */
-	if (slave && slave->queue_id && IS_UP(slave->dev) &&
-	    (slave->link == BOND_LINK_UP)) {
-		res = bond_dev_queue_xmit(bond, skb, slave->dev);
-	}
-
-	return res;
+	return 1;
 }