bcm63xx_enet: remove redundant variable definitions

in this function,‘ret’ is always assigned,so this's definition
'ret = 0' make no sense.
Signed-off-by: tangbin <tangbin@cmss.chinamobile.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bcm63xx_enet.c

@@ -1702,7 +1702,6 @@ static int bcm_enet_probe(struct platform_device *pdev)
 	if (!res_irq || !res_irq_rx || !res_irq_tx)
 		return -ENODEV;
 
-	ret = 0;
 	dev = alloc_etherdev(sizeof(*priv));
 	if (!dev)
 		return -ENOMEM;