free_index
void free_index(CA_DB *db);
free_index(db);
free_index(rdb);
if (slab->free_index > bmi) {
slab->free_index = bmi;
} else if (slab->free_index == bmi &&
u_int free_index; /* free hint index */
bmi = slab->free_index;
slab->free_index = bmi;
slab->free_index = bmi;