mld_change_state
error = mld_change_state(inm, delay);
error = mld_change_state(inm, 0);
error = mld_change_state(inm, 0);
error = mld_change_state(inm, 0);
error = mld_change_state(inm, 0);
error = mld_change_state(inm, 0);
int mld_change_state(struct in6_multi *, const int);