Fix some warnings.

Change-Id: I2ea7f6f016d34490a41e4c9449cbc92bd040de49
Reviewed-by: Dmytro Poplavskiy <dmytro.poplavskiy@nokia.com>

src/multimedia/audio/qaudiodeviceinfo.cpp

@@ -63,8 +63,8 @@ class QAudioDeviceInfoPrivate : public QSharedData
 {
 public:
     QAudioDeviceInfoPrivate()
-        : info(0),
-          mode(QAudio::AudioOutput)
+        : mode(QAudio::AudioOutput)
+        , info(0)
     {
     }
 
@@ -203,6 +203,7 @@ bool QAudioDeviceInfo::operator ==(const QAudioDeviceInfo &other) const
             && d->handle == other.d->handle
             && deviceName() == other.deviceName())
         return true;
+    return false;
 }
 
 /*!

src/multimedia/audio/qsoundeffect_qmedia_p.cpp

@@ -212,6 +212,7 @@ void QSoundEffectPrivate::mediaStatusChanged(QMediaPlayer::MediaStatus status)
 
 void QSoundEffectPrivate::error(QMediaPlayer::Error err)
 {
+    Q_UNUSED(err);
     bool playingDirty = false;
     if (m_playing) {
         m_playing = false;