net: macb: remove unnecessary code

Commit 653e92a9 ("net: macb: add support for padding and fcs
computation") introduced a bug fixed by commit 899ecaed ("net:
ethernet: cadence: fix socket buffer corruption problem"). Code removed
in this patch is not reachable at all so remove it.

Fixes: 653e92a9 ("net: macb: add support for padding and fcs computation")
Cc: Tristram Ha <Tristram.Ha@microchip.com>
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/cadence/macb_main.c

@@ -1738,12 +1738,8 @@ static int macb_pad_and_fcs(struct sk_buff **skb, struct net_device *ndev)
 		*skb = nskb;
 	}
 
-	if (padlen) {
-		if (padlen >= ETH_FCS_LEN)
-			skb_put_zero(*skb, padlen - ETH_FCS_LEN);
-		else
-			skb_trim(*skb, ETH_FCS_LEN - padlen);
-	}
+	if (padlen > ETH_FCS_LEN)
+		skb_put_zero(*skb, padlen - ETH_FCS_LEN);
 
 add_fcs:
 	/* set FCS to packet */