Fix a typo that set userptr to dmabuf fd. It leads to failure of
dmabuf-import io-mode.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2935>
if (!V4L2_TYPE_IS_MULTIPLANAR (obj->type)) {
group->buffer.bytesused = group->planes[0].bytesused;
group->buffer.length = group->planes[0].length;
- group->buffer.m.fd = group->planes[0].m.userptr;
+ group->buffer.m.fd = group->planes[0].m.fd;
/* FIXME Check if data_offset > 0 and fail for non-multi-planar */
g_assert (group->planes[0].data_offset == 0);