Update audio code to use size_t more correctly,

webrtc/modules/audio_coding/codecs/ilbc/xcorr_coef.h

 /*
  *  Copyright (c) 2011 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_XcorrCoef.h
 
 ******************************************************************/
 
 #ifndef WEBRTC_MODULES_AUDIO_CODING_CODECS_ILBC_MAIN_SOURCE_XCORR_COEF_H_
 #define WEBRTC_MODULES_AUDIO_CODING_CODECS_ILBC_MAIN_SOURCE_XCORR_COEF_H_
 
 #include "defines.h"
 
 /*----------------------------------------------------------------*
  * cross correlation which finds the optimal lag for the
  * crossCorr*crossCorr/(energy) criteria
  *---------------------------------------------------------------*/
 
-int WebRtcIlbcfix_XcorrCoef(
+size_t WebRtcIlbcfix_XcorrCoef(
     int16_t *target,  /* (i) first array */
     int16_t *regressor, /* (i) second array */
-    int16_t subl,  /* (i) dimension arrays */
-    int16_t searchLen, /* (i) the search lenght */
-    int16_t offset,  /* (i) samples offset between arrays */
+    size_t subl,  /* (i) dimension arrays */
+    size_t searchLen, /* (i) the search lenght */
+    size_t offset,  /* (i) samples offset between arrays */
     int16_t step   /* (i) +1 or -1 */
                             );
 
 #endif