leds: lp50xx: Switch to device_for_each_child_node_scoped()

Switch to device_for_each_child_node_scoped() to simplify the code by
removing the need for calls to fwnode_handle_put() in the error paths.

This also prevents possible memory leaks if new error paths are added
without the required call to fwnode_handle_put().

After switching to the scoped variant, there is no longer need for a
jump to 'child_out', as an immediate return is possible.

Signed-off-by: Javier Carrasco <[email protected]>
Link: https://lore.kernel.org/r/20240927-leds_device_for_each_child_node_scoped-v1-10-95c0614b38c8@gmail.com
Signed-off-by: Lee Jones <[email protected]>

Author: javiercarrascocruz

drivers/leds/leds-lp50xx.c

@@ -434,7 +434,6 @@ static int lp50xx_probe_leds(struct fwnode_handle *child, struct lp50xx *priv,
 
 static int lp50xx_probe_dt(struct lp50xx *priv)
 {
-	struct fwnode_handle *child = NULL;
 	struct fwnode_handle *led_node = NULL;
 	struct led_init_data init_data = {};
 	struct led_classdev *led_cdev;
@@ -454,17 +453,17 @@ static int lp50xx_probe_dt(struct lp50xx *priv)
 	if (IS_ERR(priv->regulator))
 		priv->regulator = NULL;
 
-	device_for_each_child_node(priv->dev, child) {
+	device_for_each_child_node_scoped(priv->dev, child) {
 		led = &priv->leds[i];
 		ret = fwnode_property_count_u32(child, "reg");
 		if (ret < 0) {
 			dev_err(priv->dev, "reg property is invalid\n");
-			goto child_out;
+			return ret;
 		}
 
 		ret = lp50xx_probe_leds(child, priv, led, ret);
 		if (ret)
-			goto child_out;
+			return ret;
 
 		init_data.fwnode = child;
 		num_colors = 0;
@@ -475,18 +474,16 @@ static int lp50xx_probe_dt(struct lp50xx *priv)
 		 */
 		mc_led_info = devm_kcalloc(priv->dev, LP50XX_LEDS_PER_MODULE,
 					   sizeof(*mc_led_info), GFP_KERNEL);
-		if (!mc_led_info) {
-			ret = -ENOMEM;
-			goto child_out;
-		}
+		if (!mc_led_info)
+			return -ENOMEM;
 
 		fwnode_for_each_child_node(child, led_node) {
 			ret = fwnode_property_read_u32(led_node, "color",
 						       &color_id);
 			if (ret) {
 				fwnode_handle_put(led_node);
 				dev_err(priv->dev, "Cannot read color\n");
-				goto child_out;
+				return ret;
 			}
 
 			mc_led_info[num_colors].color_index = color_id;
@@ -504,16 +501,12 @@ static int lp50xx_probe_dt(struct lp50xx *priv)
 						       &init_data);
 		if (ret) {
 			dev_err(priv->dev, "led register err: %d\n", ret);
-			goto child_out;
+			return ret;
 		}
 		i++;
 	}
 
 	return 0;
-
-child_out:
-	fwnode_handle_put(child);
-	return ret;
 }
 
 static int lp50xx_probe(struct i2c_client *client)