in_leavegroup
(void)in_leavegroup(ii->ii_allhosts, NULL);
(void)in_leavegroup(inm, imf);
(void)in_leavegroup(inm, imf);
int in_leavegroup(struct in_multi *, /*const*/ struct in_mfilter *);
in_leavegroup(imf->imf_inm, NULL);
in_leavegroup(imf->imf_inm, NULL);