Merge "audioflinger: allow unsigned overflow in getRenderPosition"

    // Maintain a 64-bit render position using the 32-bit result from the HAL.

    // This delta calculation relies on the arithmetic overflow behavior

    // of integers. For example (100 - 0xFFFFFFF0) = 116.

    uint32_t truncatedPosition = (uint32_t)mRenderPosition;

    int32_t deltaHalPosition = (int32_t)(halPosition - truncatedPosition);

    const uint32_t truncatedPosition = (uint32_t)mRenderPosition;

    int32_t deltaHalPosition; // initialization not needed, overwitten by __builtin_sub_overflow()

    (void) __builtin_sub_overflow(halPosition, truncatedPosition, &deltaHalPosition);

    if (deltaHalPosition > 0) {

        mRenderPosition += deltaHalPosition;

    }