Android: Don't call release() unless it's necessary.

If the mediaplayer is in either Idle or Uninitialized state, then there
is no need to call release again.

Change-Id: Idb6f2d9ea7aad7a9036e7e9a534c3bd296324068
Reviewed-by: Yoann Lopes <yoann.lopes@digia.com>

src/plugins/android/src/mediaplayer/qandroidmediaplayercontrol.cpp

@@ -289,7 +289,9 @@ void QAndroidMediaPlayerControl::setMedia(const QMediaContent &mediaContent,
         mMediaStream = stream;
     }
 
-    mMediaPlayer->release();
+    // Release the mediaplayer if it's not in in Idle or Uninitialized state
+    if ((mState & (JMediaPlayer::Idle | JMediaPlayer::Uninitialized)) == 0)
+        mMediaPlayer->release();
 
     if (mediaContent.isNull()) {
         setMediaStatus(QMediaPlayer::NoMedia);