[media] staging: media: go7007: firmware protection Protection for unfirmware load

If no firmware was loaded (no exists,wrong or some error) then rmmod
fails with OOPS, so need some protection stuff.

Signed-off-by: Volokh Konstantin <volokh84@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/staging/media/go7007/go7007-usb.c

@@ -1245,7 +1245,6 @@ static void go7007_usb_disconnect(struct usb_interface *intf)
 	struct urb *vurb, *aurb;
 	int i;
 
-	go->status = STATUS_SHUTDOWN;
 	usb_kill_urb(usb->intr_urb);
 
 	/* Free USB-related structs */
@@ -1269,6 +1268,7 @@ static void go7007_usb_disconnect(struct usb_interface *intf)
 	kfree(go->hpi_context);
 
 	go7007_remove(go);
+	go->status = STATUS_SHUTDOWN;
 }
 
 static struct usb_driver go7007_usb_driver = {

drivers/staging/media/go7007/go7007-v4l2.c

@@ -1832,5 +1832,6 @@ void go7007_v4l2_remove(struct go7007 *go)
 	mutex_unlock(&go->hw_lock);
 	if (go->video_dev)
 		video_unregister_device(go->video_dev);
-	v4l2_device_unregister(&go->v4l2_dev);
+	if (go->status != STATUS_SHUTDOWN)
+		v4l2_device_unregister(&go->v4l2_dev);
 }