Let RTC_[D]CHECK_op accept arguments of different signedness

webrtc/modules/audio_coding/neteq/dtmf_tone_generator.cc

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 116 matching lines @@
 
   if (event < 0 || event > 15) {
     return kParameterError;  // Invalid event number.
   }
 
   if (attenuation < 0 || attenuation > 63) {
     return kParameterError;  // Invalid attenuation.
   }
 
   // Look up oscillator coefficient for low and high frequencies.
-  RTC_DCHECK_LE(0u, fs_index);
+  RTC_DCHECK_LE(0, fs_index);
   RTC_DCHECK_GT(arraysize(kCoeff1), fs_index);
   RTC_DCHECK_GT(arraysize(kCoeff2), fs_index);
   RTC_DCHECK_LE(0, event);
   RTC_DCHECK_GT(arraysize(kCoeff1[fs_index]), static_cast<size_t>(event));
   RTC_DCHECK_GT(arraysize(kCoeff2[fs_index]), static_cast<size_t>(event));
   coeff1_ = kCoeff1[fs_index][event];
   coeff2_ = kCoeff2[fs_index][event];
 
   // Look up amplitude multiplier.
   RTC_DCHECK_LE(0, attenuation);
   RTC_DCHECK_GT(arraysize(kAmplitude), static_cast<size_t>(attenuation));
   amplitude_ = kAmplitude[attenuation];
 
   // Initialize sample history.
-  RTC_DCHECK_LE(0u, fs_index);
+  RTC_DCHECK_LE(0, fs_index);
   RTC_DCHECK_GT(arraysize(kInitValue1), fs_index);
   RTC_DCHECK_GT(arraysize(kInitValue2), fs_index);
   RTC_DCHECK_LE(0, event);
   RTC_DCHECK_GT(arraysize(kInitValue1[fs_index]), static_cast<size_t>(event));
   RTC_DCHECK_GT(arraysize(kInitValue2[fs_index]), static_cast<size_t>(event));
   sample_history1_[0] = kInitValue1[fs_index][event];
   sample_history1_[1] = 0;
   sample_history2_[0] = kInitValue2[fs_index][event];
   sample_history2_[1] = 0;
 
@@ skipping 46 matching lines @@
   }
 
   return static_cast<int>(num_samples);
 }
 
 bool DtmfToneGenerator::initialized() const {
   return initialized_;
 }
 
 }  // namespace webrtc