Update audio code to use size_t more correctly,

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

 /*
  *  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.
  */
 
@@ skipping 12 matching lines @@
  *---------------------------------------------------------------*/
 
 void WebRtcIlbcfix_HpOutput(
     int16_t *signal,     /* (i/o) signal vector */
     int16_t *ba,      /* (i)   B- and A-coefficients (2:nd order)
                                                                    {b[0] b[1] b[2] -a[1] -a[2]} a[0]
                                                                    is assumed to be 1.0 */
     int16_t *y,      /* (i/o) Filter state yhi[n-1] ylow[n-1]
                                                                    yhi[n-2] ylow[n-2] */
     int16_t *x,      /* (i/o) Filter state x[n-1] x[n-2] */
-    int16_t len)      /* (i)   Number of samples to filter */
+    size_t len)      /* (i)   Number of samples to filter */
 {
-  int i;
+  size_t i;
   int32_t tmpW32;
   int32_t tmpW32b;
 
   for (i=0; i<len; i++) {
 
     /*
       y[i] = b[0]*x[i] + b[1]*x[i-1] + b[2]*x[i-2]
       + (-a[1])*y[i-1] + (-a[2])*y[i-2];
     */
 
@@ skipping 34 matching lines @@
       tmpW32 <<= 3;
     }
 
     y[0] = (int16_t)(tmpW32 >> 16);
     y[1] = (int16_t)((tmpW32 - (y[0] << 16)) >> 1);
 
   }
 
   return;
 }