leds: lt3593: Put fwnode in any case during ->probe()

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

Fixes: 8cd7d6daba93 ("leds: lt3593: Add device tree probing glue")
Cc: Daniel Mack <[e-mail]>
Signed-off-by: Andy Shevchenko <[e-mail]>
Signed-off-by: Pavel Machek <[e-mail]>

drivers/leds/leds-lt3593.c

···
 	init_data.default_label = ":";
 
 	ret = devm_led_classdev_register_ext(dev, &led_data->cdev, &init_data);
-	if (ret < 0) {
-		fwnode_handle_put(child);
+	fwnode_handle_put(child);
+	if (ret < 0)
 		return ret;
-	}
 
 	platform_set_drvdata(pdev, led_data);