hid: hid-winwing.c
Add NULL check in the winwing_init_led

When devm_kasprintf() fails, it returns a NULL pointer. However, this return value is not properly checked in the function winwing_init_led. 

A NULL check should be added after the devm_kasprintf call to handle potential NULL pointer dereference error.

CODE:
		led->cdev.brightness_set_blocking = winwing_led_write;
		led->cdev.flags = LED_HW_PLUGGABLE;
		led->cdev.name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
						"%s::%s",
						dev_name(&input->dev),
						info->led_name);

		ret = devm_led_classdev_register(&hdev->dev, &led->cdev);
		if (ret)
			return ret;