if (video_register_device(ar->vdev, VFL_TYPE_GRABBER, video_nr) != 0) {
/* return -1, -ENFILE(full) or others */
printk("arv: register video (Colour AR) failed.\n");
if (video_register_device(ar->vdev, VFL_TYPE_GRABBER, video_nr) != 0) {
/* return -1, -ENFILE(full) or others */
printk("arv: register video (Colour AR) failed.\n");