kcrsid_setsidlist
kcr = kcrsid_setsidlist(NULL, ksl);
kcr = kcrsid_setsidlist(kcr, NULL);
kcr = kcrsid_setsidlist(kcr, NULL);
cr->cr_ksid = kcrsid_setsidlist(cr->cr_ksid, ksl);
credsid_t *kcrsid_setsidlist(credsid_t *, ksidlist_t *);