It's required, otherwise idalloc would fail. v2: renamed util_idalloc_(mt_)init param initial_num_ids (Pierre-Eric) Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com> (v1) Reviewed-by: Marek Olšák <marek.olsak@amd.com> (v2) Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11493>