Fixing string format that was breaking build.

    Vector<BufferInfo> *buffers = &mPortBuffers[portIndex];

    if (index >= buffers->size()) {

        ALOGE("getBufferAndFormat - trying to get buffer with "

              "bad index (index=%u buffer_size=%u)", index, buffers->size());

              "bad index (index=%zu buffer_size=%zu)", index, buffers->size());

        return INVALID_OPERATION;

    }

    const BufferInfo &info = buffers->itemAt(index);

    if (!info.mOwnedByClient) {

        ALOGE("getBufferAndFormat - invalid operation "

              "(index %u is not owned by client)", index);

              "(the index %zu is not owned by client)", index);

        return INVALID_OPERATION;

    }