h_free
ctf_helem_t *hep = &hp->h_chains[hp->h_free];
if (hp->h_free >= hp->h_nelems)
hp->h_buckets[h] = hp->h_free++;
hp->h_free = 1; /* first free element is index 1 */
uint_t h_free; /* index of next free hash element */
extern void h_free(char *);