net: dsa: qca8k: 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/qca/qca8k-8xxx.c

@@ -1957,8 +1957,6 @@ qca8k_sw_remove(struct mdio_device *mdiodev)
 		qca8k_port_set_status(priv, i, 0);
 
 	dsa_unregister_switch(priv->ds);
-
-	dev_set_drvdata(&mdiodev->dev, NULL);
 }
 
 static void qca8k_sw_shutdown(struct mdio_device *mdiodev)