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

webrtc/common_audio/include/audio_util.h

Index: webrtc/common_audio/include/audio_util.h
diff --git a/webrtc/common_audio/include/audio_util.h b/webrtc/common_audio/include/audio_util.h
index e5ad7015955b524fa69592a70789c09b01165d48..1601c7fd1eaeeb74409b0aa096a1c6cf304507be 100644
--- a/webrtc/common_audio/include/audio_util.h
+++ b/webrtc/common_audio/include/audio_util.h
@@ -154,7 +154,7 @@ void DownmixInterleavedToMonoImpl(const T* interleaved,
                                   int num_channels,
                                   T* deinterleaved) {
   RTC_DCHECK_GT(num_channels, 0);
-  RTC_DCHECK_GT(num_frames, 0u);
+  RTC_DCHECK_GT(num_frames, 0);
 
   const T* const end = interleaved + num_frames * num_channels;