net: stmmac: dwmac-sun8i: Use for_each_child_of_node_scoped()

Avoid need to manually handle of_node_put() by using
for_each_child_of_node_scoped(), which can simplfy code.
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c

@@ -774,8 +774,8 @@ static int sun8i_dwmac_reset(struct stmmac_priv *priv)
 static int get_ephy_nodes(struct stmmac_priv *priv)
 {
 	struct sunxi_priv_data *gmac = priv->plat->bsp_priv;
-	struct device_node *mdio_mux, *iphynode;
 	struct device_node *mdio_internal;
+	struct device_node *mdio_mux;
 	int ret;
 
 	mdio_mux = of_get_child_by_name(priv->device->of_node, "mdio-mux");
@@ -793,7 +793,7 @@ static int get_ephy_nodes(struct stmmac_priv *priv)
 	}
 
 	/* Seek for internal PHY */
-	for_each_child_of_node(mdio_internal, iphynode) {
+	for_each_child_of_node_scoped(mdio_internal, iphynode) {
 		gmac->ephy_clk = of_clk_get(iphynode, 0);
 		if (IS_ERR(gmac->ephy_clk))
 			continue;
@@ -801,14 +801,12 @@ static int get_ephy_nodes(struct stmmac_priv *priv)
 		if (IS_ERR(gmac->rst_ephy)) {
 			ret = PTR_ERR(gmac->rst_ephy);
 			if (ret == -EPROBE_DEFER) {
-				of_node_put(iphynode);
 				of_node_put(mdio_internal);
 				return ret;
 			}
 			continue;
 		}
 		dev_info(priv->device, "Found internal PHY node\n");
-		of_node_put(iphynode);
 		of_node_put(mdio_internal);
 		return 0;
 	}