wanxl: remove a stray irq enable

This is error path calls unlock_irq() where we haven't disabled the
IRQs.  The comment says that this error path can never happen.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/wan/wanxl.c

@@ -284,7 +284,7 @@ static netdev_tx_t wanxl_xmit(struct sk_buff *skb, struct net_device *dev)
                 printk(KERN_DEBUG "%s: transmitter buffer full\n", dev->name);
 #endif
 		netif_stop_queue(dev);
-		spin_unlock_irq(&port->lock);
+		spin_unlock(&port->lock);
 		return NETDEV_TX_BUSY;       /* request packet to be queued */
 	}