net: phy: mdio-bcm-unimac: remove redundant !timeout check

The check for zero timeout is always true at the end of the proceeding
while loop; the only other exit path in the loop is if the unimac MDIO
is not busy.  Remove the redundant zero timeout check and always
return -ETIMEDOUT on this timeout return path.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/mdio-bcm-unimac.c

@@ -92,10 +92,7 @@ static int unimac_mdio_poll(void *wait_func_data)
 		usleep_range(1000, 2000);
 	} while (--timeout);
 
-	if (!timeout)
 	return -ETIMEDOUT;
-
-	return 0;
 }
 
 static int unimac_mdio_read(struct mii_bus *bus, int phy_id, int reg)