QEventDispatcherWin32::processEvents Logical issues - qt

Question

When see the qt source code(QEventDispatcherWin32::processEvents),i find a Logical issues.code as below,first it writes if(!haveMessage) next if(haveMessage),so code else if (...) and else{...} will never execute,what i think is right?
code as:
if (!haveMessage) {
// no message - check for signalled objects
for (int i = 0; i < (int)nCount; i++)
pHandles[i] = d->winEventNotifierList.at(i)->handle();
waitRet = MsgWaitForMultipleObjectsEx(nCount, pHandles, 0, QS_ALLINPUT, MWMO_ALERTABLE);
if ((haveMessage = (waitRet == WAIT_OBJECT_0 + nCount))) {
// a new message has arrived, process it
continue;
}
}
if (haveMessage) {
#ifdef Q_OS_WINCE
// WinCE doesn't support hooks at all, so we have to call this by hand :(
(void) qt_GetMessageHook(0, PM_REMOVE, (LPARAM)&msg);
#endif
if (d->internalHwnd == msg.hwnd && msg.message == WM_QT_SENDPOSTEDEVENTS) {
if (seenWM_QT_SENDPOSTEDEVENTS) {
// when calling processEvents() "manually", we only want to send posted
// events once
needWM_QT_SENDPOSTEDEVENTS = true;
continue;
}
seenWM_QT_SENDPOSTEDEVENTS = true;
}
else if (msg.message == WM_TIMER) {
// avoid live-lock by keeping track of the timers we've already sent
bool found = false;
for (int i = 0; !found && i < processedTimers.count(); ++i) {
const MSG processed = processedTimers.constData()[i];
found = (processed.wParam == msg.wParam && processed.hwnd == msg.hwnd && processed.lParam == msg.lParam);
}
if (found)
continue;
processedTimers.append(msg);
}
else if (msg.message == WM_QUIT) {
if (QCoreApplication::instance())
QCoreApplication::instance()->quit();
return false;
}
if (!filterEvent(&msg)) {
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
else if (waitRet >= WAIT_OBJECT_0 && waitRet < WAIT_OBJECT_0 + nCount) {
d->activateEventNotifier(d->winEventNotifierList.at(waitRet - WAIT_OBJECT_0));
}
else {
// nothing todo so break
break;
}