usb: gadget: uvc: ensure the vdev is unset

Since the uvc video device is created on demand, we have to ensure
that the struct is always zeroed. Otherwise the previous settings
might collide with the new values.
Reviewed-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: NPaul Elder <paul.elder@ideasonboard.com>
Signed-off-by: NMichael Grzeschik <m.grzeschik@pengutronix.de>
Link: https://lore.kernel.org/r/20211017215017.18392-7-m.grzeschik@pengutronix.deSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/gadget/function/f_uvc.c

@@ -417,6 +417,7 @@ uvc_register_video(struct uvc_device *uvc)
 	int ret;
 
 	/* TODO reference counting. */
+	memset(&uvc->vdev, 0, sizeof(uvc->video));
 	uvc->vdev.v4l2_dev = &uvc->v4l2_dev;
 	uvc->vdev.v4l2_dev->dev = &cdev->gadget->dev;
 	uvc->vdev.fops = &uvc_v4l2_fops;