title: QSoundEffect always loading status in Qt 5.4
body: <p>Following code isn't working. QSoundEffect::status always return QSoundEffect::Loading and QSoundEffect::isLoaded return false.</p>
  
  <pre><code>QFile file("file.wav");
  file.open(QIODevice::ReadWrite);
  QByteArray data = file.readAll();
  file.close();
  
  QSoundEffect sound;
  sound.setSource(QUrl::fromEncoded(data));
  sound.setVolume(1.0f);
  sound.play();
  </code></pre>