net: ethernet: ti: cpsw: fix mdio device reference leak

commit 86e1d5ad upstream.

Make sure to drop the reference taken by of_find_device_by_node() when
looking up an mdio device from a phy_id property during probe.

Fixes: 549985ee ("cpsw: simplify the setup of the register
pointers")
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
[bwh: Backported to 3.16: adjust context, indentation]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

drivers/net/ethernet/ti/cpsw.c

@@ -1939,6 +1939,7 @@ static int cpsw_probe_dt(struct cpsw_platform_data *data,
 		}
 		snprintf(slave_data->phy_id, sizeof(slave_data->phy_id),
 			 PHY_ID_FMT, mdio->name, phyid);
+		put_device(&mdio->dev);
 
 		mac_addr = of_get_mac_address(slave_node);
 		if (mac_addr)