uas: Verify endpoint descriptors from uas_use_uas_driver()

static int uas_use_uas_driver(struct usb_interface *intf,

			      const struct usb_device_id *id)

{

	struct usb_host_endpoint *eps[4] = { };

	struct usb_device *udev = interface_to_usbdev(intf);

	unsigned long flags = id->driver_info;

	int r, alt;

	usb_stor_adjust_quirks(udev, &flags);

	if (flags & US_FL_IGNORE_UAS)

		return 0;

	return uas_find_uas_alt_setting(intf) >= 0;

	alt = uas_find_uas_alt_setting(intf);

	if (alt < 0)

		return 0;

	r = uas_find_endpoints(&intf->altsetting[alt], eps);

	if (r < 0)

		return 0;

	return 1;

}