Update audio code to use size_t more correctly,

webrtc/modules/audio_coding/codecs/isac/fix/source/lattice_c.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.
  */
 
 /*
  * Contains the core loop function for the lattice filter AR routine
  * for iSAC codec.
  *
  */
 
 #include "settings.h"
 #include "signal_processing_library.h"
 #include "webrtc/typedefs.h"
 
 /* Filter ar_g_Q0[] and ar_f_Q0[] through an AR filter with coefficients
  * cth_Q15[] and sth_Q15[].
  */
 void WebRtcIsacfix_FilterArLoop(int16_t* ar_g_Q0,     // Input samples
                                 int16_t* ar_f_Q0,     // Input samples
                                 int16_t* cth_Q15,     // Filter coefficients
                                 int16_t* sth_Q15,     // Filter coefficients
-                                int16_t order_coef) { // order of the filter
+                                size_t order_coef) { // order of the filter
   int n = 0;
 
   for (n = 0; n < HALF_SUBFRAMELEN - 1; n++) {
-    int k = 0;
+    size_t k = 0;
     int16_t tmpAR = 0;
     int32_t tmp32 = 0;
     int32_t tmp32_2 = 0;
 
     tmpAR = ar_f_Q0[n + 1];
     for (k = order_coef; k > 0; k--) {
       tmp32 = (cth_Q15[k - 1] * tmpAR - sth_Q15[k - 1] * ar_g_Q0[k - 1] +
                16384) >> 15;
       tmp32_2 = (sth_Q15[k - 1] * tmpAR + cth_Q15[k - 1] * ar_g_Q0[k - 1] +
                  16384) >> 15;
       tmpAR   = (int16_t)WebRtcSpl_SatW32ToW16(tmp32);
       ar_g_Q0[k] = (int16_t)WebRtcSpl_SatW32ToW16(tmp32_2);
     }
     ar_f_Q0[n + 1] = tmpAR;
     ar_g_Q0[0] = tmpAR;
   }
 }