net: dsa: lantiq_gswip: delete irrelevant use of ds->phys_mii_mask

__of_mdiobus_register(), called right next, overwrites the phy_mask
we just configured on the bus, so this is redundant and confusing.
Delete it.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Alvin Šipraga <alsi@bang-olufsen.dk>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/lantiq_gswip.c

@@ -521,7 +521,6 @@ static int gswip_mdio(struct gswip_priv *priv, struct device_node *mdio_np)
 	snprintf(ds->user_mii_bus->id, MII_BUS_ID_SIZE, "%s-mii",
 		 dev_name(priv->dev));
 	ds->user_mii_bus->parent = priv->dev;
-	ds->user_mii_bus->phy_mask = ~ds->phys_mii_mask;
 
 	err = of_mdiobus_register(ds->user_mii_bus, mdio_np);
 	if (err)