RTC_[D]CHECK_op: Remove "u" suffix on integer constants

webrtc/modules/audio_device/audio_device_buffer.cc

Index: webrtc/modules/audio_device/audio_device_buffer.cc
diff --git a/webrtc/modules/audio_device/audio_device_buffer.cc b/webrtc/modules/audio_device/audio_device_buffer.cc
index d40b05e70a4df158f7099505bb5eef0b474c1023..2e8500f5587591f534c816411512092b45e6cc38 100644
--- a/webrtc/modules/audio_device/audio_device_buffer.cc
+++ b/webrtc/modules/audio_device/audio_device_buffer.cc
@@ -409,7 +409,7 @@ int32_t AudioDeviceBuffer::RequestPlayoutData(size_t samples_per_channel) {
 
 int32_t AudioDeviceBuffer::GetPlayoutData(void* audio_buffer) {
   RTC_DCHECK_RUN_ON(&playout_thread_checker_);
-  RTC_DCHECK_GT(play_buffer_.size(), 0u);
+  RTC_DCHECK_GT(play_buffer_.size(), 0);
   const size_t bytes_per_sample = sizeof(int16_t);
   memcpy(audio_buffer, play_buffer_.data(),
          play_buffer_.size() * bytes_per_sample);