Fix some static analysis defects.

A few silly errors, a few unlikely errors, a few changes that should
not have resulted in a problem but makes the code clearer.

Change-Id: Id2c82e9317d53822e4da13c94dec9595ea33b07a
Reviewed-by: Ling Hu <ling.hu@nokia.com>
Reviewed-by: Dmytro Poplavskiy <dmytro.poplavskiy@nokia.com>

src/plugins/pulseaudio/qpulseaudioengine.cpp

@@ -183,6 +183,9 @@ Q_GLOBAL_STATIC(QPulseAudioEngine, pulseEngine);
 
 QPulseAudioEngine::QPulseAudioEngine(QObject *parent)
     : QObject(parent)
+    , m_mainLoopApi(0)
+    , m_context(0)
+
 {
     bool keepGoing = true;
     bool ok = true;