[cppcheck] Possible null pointer dereference in qqmlnotifier.cpp

void QQmlNotifier::emitNotify(QQmlNotifierEndpoint *endpoint)
{
    QQmlNotifierEndpoint **oldDisconnected = endpoint->disconnected; // LINE 49
    endpoint->disconnected = &endpoint;
    endpoint->notifying = 1;

    if (endpoint->next)
        emitNotify(endpoint->next);

    if (endpoint) { // LINE 56

        Q_ASSERT(endpoint->callback);
        
        endpoint->callback(endpoint);

        if (endpoint) 
            endpoint->disconnected = oldDisconnected;
    } 

    if (oldDisconnected) *oldDisconnected = endpoint;
    else if (endpoint) endpoint->notifying = 0;
}