Update audio code to use size_t more correctly,

webrtc/common_audio/signal_processing/energy.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.
  */
 
 
 /*
  * This file contains the function WebRtcSpl_Energy().
  * The description header can be found in signal_processing_library.h
  *
  */
 
 #include "webrtc/common_audio/signal_processing/include/signal_processing_library.h"
 
-int32_t WebRtcSpl_Energy(int16_t* vector, int vector_length, int* scale_factor)
+int32_t WebRtcSpl_Energy(int16_t* vector,
+                         size_t vector_length,
+                         int* scale_factor)
 {
     int32_t en = 0;
-    int i;
+    size_t i;
     int scaling =
         WebRtcSpl_GetScalingSquare(vector, vector_length, vector_length);
-    int looptimes = vector_length;
+    size_t looptimes = vector_length;
     int16_t *vectorptr = vector;
 
     for (i = 0; i < looptimes; i++)
     {
       en += (*vectorptr * *vectorptr) >> scaling;
       vectorptr++;
     }
     *scale_factor = scaling;
 
     return en;
 }