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

webrtc/modules/rtp_rtcp/source/rtcp_packet/fir.cc

 /*
  *  Copyright (c) 2016 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 66 matching lines @@
                  size_t max_length,
                  RtcpPacket::PacketReadyCallback* callback) const {
   RTC_DCHECK(!items_.empty());
   while (*index + BlockLength() > max_length) {
     if (!OnBufferFull(packet, index, callback))
       return false;
   }
   size_t index_end = *index + BlockLength();
   CreateHeader(kFeedbackMessageType, kPacketType, HeaderLength(), packet,
                index);
-  RTC_DCHECK_EQ(Psfb::media_ssrc(), 0u);
+  RTC_DCHECK_EQ(Psfb::media_ssrc(), 0);
   CreateCommonFeedback(packet + *index);
   *index += kCommonFeedbackLength;
 
   constexpr uint32_t kReserved = 0;
   for (const Request& request : items_) {
     ByteWriter<uint32_t>::WriteBigEndian(packet + *index, request.ssrc);
     ByteWriter<uint8_t>::WriteBigEndian(packet + *index + 4, request.seq_nr);
     ByteWriter<uint32_t, 3>::WriteBigEndian(packet + *index + 5, kReserved);
     *index += kFciLength;
   }
   RTC_CHECK_EQ(*index, index_end);
   return true;
 }
 }  // namespace rtcp
 }  // namespace webrtc