Don't use sp<>&

because they may end up pointing to NULL after a NULL check was performed.

Bug: 28166152
Change-Id: Iab2ea30395b620628cc6f3d067dd4f6fcda824fe

void MediaRecorder::died()
{
    ALOGV("died");
    notify(MEDIA_RECORDER_EVENT_ERROR, MEDIA_ERROR_SERVER_DIED, 0);
}

void MediaRecorder::died()
{
    ALOGV("died");
    notify(MEDIA_RECORDER_EVENT_ERROR, MEDIA_ERROR_SERVER_DIED, 0);
}
