net: phy: mscc: fix memory leak in vsc8574_config_pre_init

In case memory resources for *fw* were successfully allocated,
release them before return.

Addresses-Coverity-ID: 1473968 ("Resource leak")
Fixes: 00d70d8 ("net: phy: mscc: add support for VSC8574 PHY")
Reviewed-by: Quentin Schulz <quentin.schulz@bootlin.com>
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/mscc.c

@@ -1292,7 +1292,7 @@ static int vsc8574_config_pre_init(struct phy_device *phydev)
 				dev_err(dev,
 					"%s: failed to assert reset of micro\n",
 					__func__);
-				return ret;
+				goto out;
 			}
 		}
 	} else {