net: dsa: xrs700x: 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/xrs700x/xrs700x_mdio.c

@@ -140,8 +140,6 @@ static void xrs700x_mdio_remove(struct mdio_device *mdiodev)
 		return;
 
 	xrs700x_switch_remove(priv);
-
-	dev_set_drvdata(&mdiodev->dev, NULL);
 }
 
 static void xrs700x_mdio_shutdown(struct mdio_device *mdiodev)