dsa: Remove master_dev from switch structure

The switch drivers only use the master_dev member for dev_info()
messages.  Now that the device is passed to the old style probe, and
new style drivers are probed as true linux drivers, this is no longer
needed.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 5ea8a40..f25dcd9 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -51,7 +51,7 @@
 	ds->slave_mii_bus->write = dsa_slave_phy_write;
 	snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d:%.2x",
 			ds->index, ds->pd->sw_addr);
-	ds->slave_mii_bus->parent = ds->master_dev;
+	ds->slave_mii_bus->parent = ds->dev;
 	ds->slave_mii_bus->phy_mask = ~ds->phys_mii_mask;
 }