net: dsa: microchip: Use scoped function to simplfy code

Avoids the need for manual cleanup of_node_put() in early exits
from the loop by using for_each_available_child_of_node_scoped().
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/dsa/microchip/ksz_common.c

@@ -4717,7 +4717,7 @@ static int ksz_parse_drive_strength(struct ksz_device *dev)
 int ksz_switch_register(struct ksz_device *dev)
 {
 	const struct ksz_chip_data *info;
-	struct device_node *port, *ports;
+	struct device_node *ports;
 	phy_interface_t interface;
 	unsigned int port_num;
 	int ret;
@@ -4803,12 +4803,11 @@ int ksz_switch_register(struct ksz_device *dev)
 		if (!ports)
 			ports = of_get_child_by_name(dev->dev->of_node, "ports");
 		if (ports) {
-			for_each_available_child_of_node(ports, port) {
+			for_each_available_child_of_node_scoped(ports, port) {
 				if (of_property_read_u32(port, "reg",
 							 &port_num))
 					continue;
 				if (!(dev->port_mask & BIT(port_num))) {
-					of_node_put(port);
 					of_node_put(ports);
 					return -EINVAL;
 				}