ns83820: remove some pointless conditionals before kfree_skb()

Remove some pointless conditionals before kfree_skb().

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ns83820.c

@@ -822,8 +822,7 @@ static void ns83820_cleanup_rx(struct ns83820 *dev)
 		struct sk_buff *skb = dev->rx_info.skbs[i];
 		dev->rx_info.skbs[i] = NULL;
 		clear_rx_desc(dev, i);
-		if (skb)
-			kfree_skb(skb);
+		kfree_skb(skb);
 	}
 }