QObjectPrivate::receiverList() may be incorrect

// Used by QAccessibleWidget
QObjectList QObjectPrivate::receiverList(const char *signal) const
{
    Q_Q(const QObject);
    QObjectList returnValue;
    int signal_index = signalIndex(signal);
    if (signal_index < 0)
        return returnValue;
    QMutexLocker locker(signalSlotLock(q));
    if (connectionLists) {
        if (signal_index < connectionLists->count()) {
            const QObjectPrivate::Connection *c = connectionLists->at(signal_index).first;

            while (c) {
                if (c->receiver)
                    returnValue << c->receiver;
                c = c->nextConnectionList;
            }
        }
    }
    return returnValue;
}