Initialize the mock player state variables.

So valgrind is less grumpy.

Change-Id: I3219fd1eaa2296bc6e158876137e0b79c4d8b714
Reviewed-by: Ling Hu <ling.hu@nokia.com>
Reviewed-by: Dmytro Poplavskiy <dmytro.poplavskiy@nokia.com>

tests/auto/unit/qmultimedia_common/mockmediaplayercontrol.h

@@ -49,7 +49,23 @@ class MockMediaPlayerControl : public QMediaPlayerControl
     friend class MockMediaPlayerService;
 
 public:
-    MockMediaPlayerControl():QMediaPlayerControl(0) {}
+    MockMediaPlayerControl()
+        : QMediaPlayerControl(0)
+        , _state(QMediaPlayer::StoppedState)
+        , _mediaStatus(QMediaPlayer::NoMedia)
+        , _error(QMediaPlayer::NoError)
+        , _duration(0)
+        , _position(0)
+        , _volume(100)
+        , _muted(false)
+        , _bufferStatus(0)
+        , _audioAvailable(false)
+        , _videoAvailable(false)
+        , _isSeekable(true)
+        , _playbackRate(qreal(1.0))
+        , _stream(0)
+        , _isValid(false)
+    {}
 
     QMediaPlayer::State state() const { return _state; }
     QMediaPlayer::MediaStatus mediaStatus() const { return _mediaStatus; }