drivers/net/acenic.c: fix check-after-use

The Coverity checker noted that we've already dereferenced "dev" when we
check whether it's NULL.

Since it's impossible that "dev" is NULL at this place this patch
removes the NULL check.
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/net/acenic.c

@@ -3128,12 +3128,6 @@ static int __devinit read_eeprom_byte(struct net_device *dev,
 	int result = 0;
 	short i;
 
-	if (!dev) {
-		printk(KERN_ERR "No device!\n");
-		result = -ENODEV;
-		goto out;
-	}
-
 	/*
 	 * Don't take interrupts on this CPU will bit banging
 	 * the %#%#@$ I2C device