Tracks: Fix memory leak.

                                pid_t creatorPid,

                                uid_t uid,

                                bool isOut,

                                alloc_type alloc = ALLOC_CBLK,

                                const alloc_type alloc = ALLOC_CBLK,

                                track_type type = TYPE_DEFAULT,

                                audio_port_handle_t portId = AUDIO_PORT_HANDLE_NONE,

                                std::string metricsId = {});

                                    // this could be a track type if needed later

    const wp<ThreadBase> mThread;

    const alloc_type     mAllocType;

    /*const*/ sp<Client> mClient;   // see explanation at ~TrackBase() why not const

    sp<IMemory>         mCblkMemory;

    audio_track_cblk_t* mCblk;

            pid_t creatorPid,

            uid_t clientUid,

            bool isOut,

            alloc_type alloc,

            const alloc_type alloc,

            track_type type,

            audio_port_handle_t portId,

            std::string metricsId)

    :   RefBase(),

        mThread(thread),

        mAllocType(alloc),

        mClient(client),

        mCblk(NULL),

        // mBuffer, mBufferSize

        // relying on the automatic clear() at end of scope.

        mClient.clear();

    }

    if (mAllocType == ALLOC_LOCAL) {

        free(mBuffer);

        mBuffer = nullptr;

    }

    // flush the binder command buffer

    IPCThreadState::self()->flushCommands();

}