Prepare to convert various types to size_t.

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.
  */
 
@@ skipping 17 matching lines @@
                                 int16_t order_coef) { // order of the filter
   int n = 0;
 
   for (n = 0; n < HALF_SUBFRAMELEN - 1; n++) {
     int 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 - 1; k >= 0; k--) {
-      tmp32 = (cth_Q15[k] * tmpAR - sth_Q15[k] * ar_g_Q0[k] + 16384) >> 15;
-      tmp32_2 = (sth_Q15[k] * tmpAR + cth_Q15[k] * ar_g_Q0[k] + 16384) >> 15;
+    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 + 1] = (int16_t)WebRtcSpl_SatW32ToW16(tmp32_2);
+      ar_g_Q0[k] = (int16_t)WebRtcSpl_SatW32ToW16(tmp32_2);
     }
     ar_f_Q0[n + 1] = tmpAR;
     ar_g_Q0[0] = tmpAR;
   }
 }