Function controllerInList

tests/fastled_core.cpp:531–538

}

static bool controllerInList(CLEDController* ctrl) {
    CLEDController* cur = CLEDController::head();
    while (cur) {
        if (cur == ctrl) return true;
        cur = cur->next();
    }
    return false;
}

static bool controllerInList(fl::Channel* channel) {
    return controllerInList(channel->asController());