net: cpsw: add missing of_node_put

Add missing of_node_put to avoid kref leak.
Signed-off-by: NJohan Hovold <jhovold@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/ti/cpsw.c

@@ -1871,6 +1871,7 @@ static int cpsw_probe_dt(struct cpsw_platform_data *data,
 		mdio_node = of_find_node_by_phandle(be32_to_cpup(parp));
 		phyid = be32_to_cpup(parp+1);
 		mdio = of_find_device_by_node(mdio_node);
+		of_node_put(mdio_node);
 		if (!mdio) {
 			pr_err("Missing mdio platform device\n");
 			return -EINVAL;