Update audio code to use size_t more correctly,

webrtc/modules/audio_coding/codecs/ilbc/swap_bytes.c

 /*
  *  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.
  */
 
 /******************************************************************
 
  iLBC Speech Coder ANSI-C Source Code
 
  WebRtcIlbcfix_SwapBytes.c
 
 ******************************************************************/
 
 #include "defines.h"
 
 /*----------------------------------------------------------------*
  * Swap bytes (to simplify operations on Little Endian machines)
  *---------------------------------------------------------------*/
 
 void WebRtcIlbcfix_SwapBytes(
     const uint16_t* input,   /* (i) the sequence to swap */
-    int16_t wordLength,      /* (i) number or uint16_t to swap */
+    size_t wordLength,      /* (i) number or uint16_t to swap */
     uint16_t* output         /* (o) the swapped sequence */
                               ) {
-  int k;
+  size_t k;
   for (k = wordLength; k > 0; k--) {
     *output++ = (*input >> 8)|(*input << 8);
     input++;
   }
 }