Merge "AudioFlinger: Do not dereference null track"

        output.afFrameCount = thread->frameCount();

        output.afSampleRate = thread->sampleRate();

        output.afLatencyMs = thread->latency();

        output.trackId = track->id();

        output.trackId = track == nullptr ? -1 : track->id();

        // move effect chain to this output thread if an effect on same session was waiting

        // for a track to be created