net: dsa: mv88e6xxx: remove redundant assignments

The chip->ds and ds->slave_mii_bus assignments are common to both legacy
and new MDIO probing and are already done in the later setup code.

Remove the duplicated assignments from the MDIO probing code.
Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/mv88e6xxx.c

@@ -3708,7 +3708,6 @@ static int mv88e6xxx_probe(struct mdio_device *mdiodev)
 	ds->priv = ps;
 	ds->dev = dev;
 	ps->dev = dev;
-	ps->ds = ds;
 	ps->bus = mdiodev->bus;
 	ps->sw_addr = mdiodev->addr;
 	mutex_init(&ps->smi_mutex);
@@ -3748,8 +3747,6 @@ static int mv88e6xxx_probe(struct mdio_device *mdiodev)
 	if (err)
 		return err;
 
-	ds->slave_mii_bus = ps->mdio_bus;
-
 	dev_set_drvdata(dev, ds);
 
 	err = dsa_register_switch(ds, mdiodev->dev.of_node);