leds: pca963x: 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 'err', as an immediate return is possible.

Signed-off-by: Javier Carrasco <[e-mail]>
Link: https://lore.kernel.org/r/20[e-mail]
Signed-off-by: Lee Jones <[e-mail]>

drivers/leds/leds-pca963x.c

···
 	struct pca963x_chipdef *chipdef = chip->chipdef;
 	struct pca963x_led *led = chip->leds;
 	struct device *dev = &client->dev;
-	struct fwnode_handle *child;
 	bool hw_blink;
 	s32 mode2;
 	u32 reg;
···
 	if (ret < 0)
 		return ret;
 
-	device_for_each_child_node(dev, child) {
+	device_for_each_child_node_scoped(dev, child) {
 		struct led_init_data init_data = {};
 		char default_label[32];
 
···
 		if (ret || reg >= chipdef->n_leds) {
 			dev_err(dev, "Invalid 'reg' property for node %pfw\n",
 				child);
-			ret = -EINVAL;
-			goto err;
+			return -EINVAL;
 		}
 
 		led->led_num = reg;
···
 		if (ret) {
 			dev_err(dev, "Failed to register LED for node %pfw\n",
 				child);
-			goto err;
+			return ret;
 		}
 
 		++led;
 	}
 
 	return 0;
-err:
-	fwnode_handle_put(child);
-	return ret;
 }
 
 static int pca963x_suspend(struct device *dev)