am f9824c7f: Return no track selected if no track is currently selected.

    private void sendTrackChangedRsp() {

        byte[] track = new byte[TRACK_ID_SIZE];

        /* If no track is currently selected, then return

           0xFFFFFFFFFFFFFFFF in the interim response */

        long trackNumberRsp = -1L;

        if (mCurrentPlayState == RemoteControlClient.PLAYSTATE_PLAYING) {

            trackNumberRsp = mTrackNumber;

        }

        /* track is stored in big endian format */

        for (int i = 0; i < TRACK_ID_SIZE; ++i) {

            track[i] = (byte) (mTrackNumber >> (56 - 8 * i));

            track[i] = (byte) (trackNumberRsp >> (56 - 8 * i));

        }

        registerNotificationRspTrackChangeNative(mTrackChangedNT, track);

    }