at76c50x-usb: remove pointless conditional before kfree_skb()

Remove pointless conditional before kfree_skb().
Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/wireless/at76c50x-usb.c

@@ -2309,7 +2309,6 @@ static void at76_delete_device(struct at76_priv *priv)
 
 	del_timer_sync(&ledtrig_tx_timer);
 
-	if (priv->rx_skb)
 	kfree_skb(priv->rx_skb);
 
 	usb_put_dev(priv->udev);