gpt_add_ais
if (gpt_add_ais(gpt, &alignment, &entry, &size, ch)
int gpt_add_ais(gpt_t, off_t *, u_int *, off_t *, int);
else if (gpt_add_ais(gpt, &alignment, &entry, &size, ch) == -1)
if (gpt_add_ais(gpt, NULL, NULL, &size, ch) == -1)