of: mdio: Add of_node_put() when breaking out of for_each_xx

In of_mdiobus_register(), we should call of_node_put() for 'child'
escaped out of for_each_available_child_of_node().

Fixes: 66bdede4 ("of_mdio: Fix broken PHY IRQ in case of probe deferral")
Co-developed-by: Miaoqian Lin <linmq006@gmail.com>
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Signed-off-by: Liang He <windhl@126.com>
Link: https://lore.kernel.org/r/20220913125659.3331969-1-windhl@126.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/mdio/of_mdio.c

@@ -231,6 +231,7 @@ int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
 	return 0;
 
 unregister:
+	of_node_put(child);
 	mdiobus_unregister(mdio);
 	return rc;
 }