net: ethernet: actions: Use of_get_available_child_by_name()

Use the helper of_get_available_child_by_name() to simplify
owl_emac_mdio_init().

Signed-off-by: Biju Das <[e-mail]>
Reviewed-by: Simon Horman <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ethernet/actions/owl-emac.c

···
 	struct device_node *mdio_node;
 	int ret;
 
-	mdio_node = of_get_child_by_name(dev->of_node, "mdio");
+	mdio_node = of_get_available_child_by_name(dev->of_node, "mdio");
 	if (!mdio_node)
 		return -ENODEV;
-
-	if (!of_device_is_available(mdio_node)) {
-		ret = -ENODEV;
-		goto err_put_node;
-	}
 
 	priv->mii = devm_mdiobus_alloc(dev);
 	if (!priv->mii) {