in6_leavegroup
in6_leavegroup(im6f[0]->im6f_in6m, NULL);
in6_leavegroup(im6f->im6f_in6m, NULL);
in6_leavegroup(imm->i6mm_maddr, NULL);
in6_leavegroup(inm, NULL);
(void)in6_leavegroup(inm, imf);
(void)in6_leavegroup(inm, imf);
int in6_leavegroup(struct in6_multi *, struct in6_mfilter *);
in6_leavegroup(im6f->im6f_in6m, NULL);