fixed: video for linux device is busy causes fatal error

videodev-v4l2.cc

@@ -204,6 +204,8 @@ int VideoDev_V4L2::Open() {
 	fmt.fmt.pix.field       = V4L2_FIELD_NONE;
 	if (-1 == xioctl (fd, VIDIOC_S_FMT, &fmt)) {
 		fprintf (stderr, "%s:%d VIDIOC_S_FMT : %s\n", __FILE__, __LINE__, strerror (errno));
+		close (fd);
+		fd = -1;
 		return VDEV_STATUS_ERROR;
 	}