static void cleanup_unknown_header_ext(BlockDriverState *bs)
{
    BDRVQcowState *s = bs->opaque;
    Qcow2UnknownHeaderExtension *uext, *next;

    QLIST_FOREACH_SAFE(uext, &s->unknown_header_ext, next, next) {
        QLIST_REMOVE(uext, next);
        g_free(uext);
    }
}
Unknown