net: dsa: mv88e6xxx: remove unnecessary dev_set_drvdata()

Remove unnecessary dev_set_drvdata() in ->remove(), the driver_data will
be set to NULL in device_unbind_cleanup() after calling ->remove().
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/dsa/mv88e6xxx/chip.c

@@ -7185,8 +7185,6 @@ static void mv88e6xxx_remove(struct mdio_device *mdiodev)
 		mv88e6xxx_g1_irq_free(chip);
 	else
 		mv88e6xxx_irq_poll_free(chip);
-
-	dev_set_drvdata(&mdiodev->dev, NULL);
 }
 
 static void mv88e6xxx_shutdown(struct mdio_device *mdiodev)