[C++] Warnings cleanup.

Author: mjpt777

sbe-benchmarks/src/main/cpp/SbeCarCodecBench.h

@@ -73,8 +73,8 @@ class SbeCarCodecBench : public CodecBench<SbeCarCodecBench>
  .next().mph(60).seconds(7.1f)
  .next().mph(100).seconds(11.8f);
 
- car.putManufacturer(MANUFACTURER, MANUFACTURER_LEN);
- car.putModel(MODEL, MODEL_LEN);
+ car.putManufacturer(MANUFACTURER, static_cast<std::uint32_t>(MANUFACTURER_LEN));
+ car.putModel(MODEL, static_cast<std::uint32_t>(MODEL_LEN));
 
  return car.encodedLength();
  }