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

webrtc/modules/audio_coding/codecs/pcm16b/audio_decoder_pcm16b.cc

Index: webrtc/modules/audio_coding/codecs/pcm16b/audio_decoder_pcm16b.cc
diff --git a/webrtc/modules/audio_coding/codecs/pcm16b/audio_decoder_pcm16b.cc b/webrtc/modules/audio_coding/codecs/pcm16b/audio_decoder_pcm16b.cc
index 43d2dacf9b88f61655b71519703d43e51d379e88..692e212ed976c5669f1dc498c0412ed932773247 100644
--- a/webrtc/modules/audio_coding/codecs/pcm16b/audio_decoder_pcm16b.cc
+++ b/webrtc/modules/audio_coding/codecs/pcm16b/audio_decoder_pcm16b.cc
@@ -21,7 +21,7 @@ AudioDecoderPcm16B::AudioDecoderPcm16B(int sample_rate_hz, size_t num_channels)
   RTC_DCHECK(sample_rate_hz == 8000 || sample_rate_hz == 16000 ||
              sample_rate_hz == 32000 || sample_rate_hz == 48000)
       << "Unsupported sample rate " << sample_rate_hz;
-  RTC_DCHECK_GE(num_channels, 1u);
+  RTC_DCHECK_GE(num_channels, 1);
 }
 
 void AudioDecoderPcm16B::Reset() {}