Merge "Do not initialize shared memory pointer when mmap fails."

        return AAUDIO_ERROR_INTERNAL; // TODO convert errno to a better AAUDIO_ERROR;

    }

    // Map the fd to memory addresses.

    mSharedMemory = (uint8_t *) mmap(0, mSharedMemorySizeInBytes,

    // Map the fd to memory addresses. Use a temporary pointer to keep the mmap result and update

    // it to `mSharedMemory` only when mmap operate successfully.

    uint8_t* tmpPtr = (uint8_t *) mmap(0, mSharedMemorySizeInBytes,

                         PROT_READ|PROT_WRITE,

                         MAP_SHARED,

                         mFileDescriptor.get(), 0);

    if (mSharedMemory == MAP_FAILED) {

    if (tmpPtr == MAP_FAILED) {

        ALOGE("allocate() mmap() failed %d", errno);

        mFileDescriptor.reset();

        return AAUDIO_ERROR_INTERNAL; // TODO convert errno to a better AAUDIO_ERROR;

    }

    mSharedMemory = tmpPtr;

    // Get addresses for our counters and data from the shared memory.

    fifo_counter_t *readCounterAddress =