Merge "usb: gadget: gps: Handle case when response queue is empty"

/*

 * Copyright (c) 2011-2014, The Linux Foundation. All rights reserved.

 * Copyright (c) 2011-2016, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and

			spin_lock(&dev->lock);

			if (list_empty(&dev->cpkt_resp_q)) {

				pr_err("%s: ctrl resp queue empty", __func__);

				spin_unlock(&dev->lock);

				pr_debug("%s: ctrl resp queue empty", __func__);

				ret = 0;

				goto invalid;

			}