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

webrtc/common_audio/resampler/push_resampler.cc

Index: webrtc/common_audio/resampler/push_resampler.cc
diff --git a/webrtc/common_audio/resampler/push_resampler.cc b/webrtc/common_audio/resampler/push_resampler.cc
index 9f329c4cb99634426216b8862a6d794844b8bb43..788223d343dc99ab9437cf65820a6dd344e2ddf3 100644
--- a/webrtc/common_audio/resampler/push_resampler.cc
+++ b/webrtc/common_audio/resampler/push_resampler.cc
@@ -32,8 +32,8 @@ void CheckValidInitParams(int src_sample_rate_hz, int dst_sample_rate_hz,
 #if !defined(WEBRTC_WIN) && defined(__clang__)
   RTC_DCHECK_GT(src_sample_rate_hz, 0);
   RTC_DCHECK_GT(dst_sample_rate_hz, 0);
-  RTC_DCHECK_GT(num_channels, 0u);
-  RTC_DCHECK_LE(num_channels, 2u);
+  RTC_DCHECK_GT(num_channels, 0);
+  RTC_DCHECK_LE(num_channels, 2);
 #endif
 }