zeroconf: avoid double triggering of hadFailure

Change-Id: Ia4e2da06714b06fc7a98a0acb6d3868fc4bafca9
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@nokia.com>

src/libs/zeroconf/servicebrowser.cpp

@@ -1852,6 +1852,7 @@ void  MainConnection::handleEvents()
     if (m_nErrs > 0){
         QString browsersNames = (m_browsers.isEmpty() ? QString() : m_browsers.at(0)->serviceType)
                 + ((m_browsers.count() > 1) ? QString::fromLatin1(",...") : QString());
+        if (isOk())
             appendError(ErrorMessage::FailureLevel, tr("MainConnection for [%1] accumulated %2 consecutive errors, aborting")
                         .arg(browsersNames).arg(m_nErrs));
     }