am f436fdcf: audioflinger: change session check in createTrack.

        ALOGV("createTrack() sessionId: %d", (sessionId == NULL) ? -2 : *sessionId);

        if (sessionId != NULL && *sessionId != AUDIO_SESSION_OUTPUT_MIX) {

            // check if an effect chain with the same session ID is present on another

            // output thread and move it here.

            for (size_t i = 0; i < mPlaybackThreads.size(); i++) {

                sp<PlaybackThread> t = mPlaybackThreads.valueAt(i);

                if (mPlaybackThreads.keyAt(i) != output) {

                    // prevent same audio session on different output threads

                    uint32_t sessions = t->hasAudioSession(*sessionId);

                    if (sessions & PlaybackThread::TRACK_SESSION) {

                        ALOGE("createTrack() session ID %d already in use", *sessionId);

                        lStatus = BAD_VALUE;

                        goto Exit;

                    }

                    // check if an effect with same session ID is waiting for a track to be created

                    if (sessions & PlaybackThread::EFFECT_SESSION) {

                        effectThread = t.get();

                        break;

                    }

                }

            }