engine_unlocked_finish
to_return = engine_unlocked_finish(e, 1);
int engine_unlocked_finish(ENGINE *e, int unlock_for_handlers);
engine_unlocked_finish(fnd->funct, 0);
engine_unlocked_finish(e, 0);
engine_unlocked_finish(p->funct, 0);
engine_unlocked_finish(fnd->funct, 0);