phy: mdio-sun4i: add missed regulator_disable in remove

The driver forgets to disable the regulator in remove like what is done
in probe failure.
Add the missed call to fix it.
Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/mdio-sun4i.c

@@ -145,8 +145,11 @@ static int sun4i_mdio_probe(struct platform_device *pdev)
 static int sun4i_mdio_remove(struct platform_device *pdev)
 {
 	struct mii_bus *bus = platform_get_drvdata(pdev);
+	struct sun4i_mdio_data *data = bus->priv;
 
 	mdiobus_unregister(bus);
+	if (data->regulator)
+		regulator_disable(data->regulator);
 	mdiobus_free(bus);
 
 	return 0;