gpio: sim: add missing fwnode_handle_put() in gpio_sim_probe()

Calling fwnode_handle_put() when break out of device_for_each_child_node(),
or the device node reference will be leakd.

Fixes: 83960fcf4818 ("gpio: sim: new testing module")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>

drivers/gpio/gpio-sim.c

@@ -444,8 +444,10 @@ static int gpio_sim_probe(struct platform_device *pdev)
 
 	device_for_each_child_node(dev, swnode) {
 		ret = gpio_sim_add_bank(swnode, dev);
-		if (ret)
+		if (ret) {
+			fwnode_handle_put(swnode);
 			return ret;
+		}
 	}
 
 	return 0;