Fix Chromium clang plugin warnings

webrtc/modules/audio_coding/test/PCMFile.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 28 matching lines @@
       samples_10ms_(160),
       frequency_(16000),
       end_of_file_(false),
       auto_rewind_(false),
       rewinded_(false),
       read_stereo_(false),
       save_stereo_(false) {
   timestamp_ = timestamp;
 }
 
+PCMFile::~PCMFile() {
+  if (pcm_file_) {
+    fclose(pcm_file_);
+  }
+}
+
 int16_t PCMFile::ChooseFile(std::string* file_name, int16_t max_len,
                             uint16_t* frequency_hz) {
   char tmp_name[MAX_FILE_NAME_LENGTH_BYTE];
 
   EXPECT_TRUE(fgets(tmp_name, MAX_FILE_NAME_LENGTH_BYTE, stdin) != NULL);
   tmp_name[MAX_FILE_NAME_LENGTH_BYTE - 1] = '\0';
   int16_t n = 0;
 
   // Removing trailing spaces.
   while ((isspace(tmp_name[n]) || iscntrl(tmp_name[n])) && (tmp_name[n] != 0)
@@ skipping 153 matching lines @@
 
 void PCMFile::ReadStereo(bool is_stereo) {
   read_stereo_ = is_stereo;
 }
 
 void PCMFile::SetNum10MsBlocksToRead(int value) {
   num_10ms_blocks_to_read_ = rtc::Optional<int>(value);
 }
 
 }  // namespace webrtc