multilist_sublist_prev
for (hdr = multilist_sublist_prev(mls, marker); hdr != NULL;
hdr = multilist_sublist_prev(mls, marker)) {
data_hdr = multilist_sublist_prev(data_mls, data_hdr)) {
meta_hdr = multilist_sublist_prev(meta_mls, meta_hdr)) {
hdr_prev = multilist_sublist_prev(mls, hdr);
db = multilist_sublist_prev(mls, db);
void *multilist_sublist_prev(multilist_sublist_t *, void *);