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>
diff --git a/drivers/net/wireless/at76c50x-usb.c b/drivers/net/wireless/at76c50x-usb.c
index 0c02f1c..c220c97 100644
--- a/drivers/net/wireless/at76c50x-usb.c
+++ b/drivers/net/wireless/at76c50x-usb.c
@@ -2309,8 +2309,7 @@
 
 	del_timer_sync(&ledtrig_tx_timer);
 
-	if (priv->rx_skb)
-		kfree_skb(priv->rx_skb);
+	kfree_skb(priv->rx_skb);
 
 	usb_put_dev(priv->udev);