leds: rt8515: Put fwnode in any case during ->probe()

fwnode_get_next_available_child_node() bumps a reference counting of
a returned variable. We have to balance it whenever we return to
the caller.

Fixes: e1c6edcbea13 ("leds: rt8515: Add Richtek RT8515 LED driver")
Signed-off-by: Andy Shevchenko <[e-mail]>
Signed-off-by: Pavel Machek <[e-mail]>
Reviewed-by: Linus Walleij <[e-mail]>

drivers/leds/flash/leds-rt8515.c

···
 
 	ret = devm_led_classdev_flash_register_ext(dev, fled, &init_data);
 	if (ret) {
-		dev_err(dev, "can't register LED %s\n", led->name);
+		fwnode_handle_put(child);
 		mutex_destroy(&rt->lock);
+		dev_err(dev, "can't register LED %s\n", led->name);
 		return ret;
 	}
 
···
 		 */
 	}
 
+	fwnode_handle_put(child);
 	return 0;
 }