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>
Signed-off-by: SZ Lin (林上智) <sz.lin@moxa.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/net/ethernet/ti/cpsw.c

@@ -2086,6 +2086,7 @@ 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);
 		} else {
 			dev_err(&pdev->dev, "No slave[%d] phy_id or fixed-link property\n", i);
 			goto no_phy_slave;