message: fix var name to follow style
diff: @@ -1058,9 +1058,9 @@ DeviceDescription *CUDAExecutor::PopulateDeviceDescription() const {
  CU_DEVICE_ATTRIBUTE_MAX_BLOCK_DIM_Z, device_).ValueOrDie();
  builder.set_thread_dim_limit(thread_dim_limit);
  - int clockRate = CUDADriver::GetDeviceAttribute(
  + int clock_rate = CUDADriver::GetDeviceAttribute(
  CU_DEVICE_ATTRIBUTE_CLOCK_RATE, device_).ValueOrDie();
  - builder.set_clock_rate_ghz(static_cast<float>(clockRate) / 1e6);
  + builder.set_clock_rate_ghz(static_cast<float>(clock_rate) / 1e6);
  }
  {
  