Prepare to convert various types to size_t.

webrtc/common_audio/signal_processing/levinson_durbin.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 23 matching lines @@
     // Prediction gain Alpha in high precision and with scale factor
     int16_t Alpha_hi, Alpha_low, Alpha_exp;
     int16_t tmp_hi, tmp_low;
     int32_t temp1W32, temp2W32, temp3W32;
     int16_t norm;
 
     // Normalize the autocorrelation R[0]...R[order+1]
 
     norm = WebRtcSpl_NormW32(R[0]);
 
-    for (i = order; i >= 0; i--)
+    for (i = 0; i <= order; ++i)
     {
         temp1W32 = WEBRTC_SPL_LSHIFT_W32(R[i], norm);
         // Put R in hi and low format
         R_hi[i] = (int16_t)(temp1W32 >> 16);
         R_low[i] = (int16_t)((temp1W32 - ((int32_t)R_hi[i] << 16)) >> 1);
     }
 
     // K = A[1] = -R[1] / R[0]
 
     temp2W32 = WEBRTC_SPL_LSHIFT_W32((int32_t)R_hi[1],16)
@@ skipping 182 matching lines @@
     for (i = 1; i <= order; i++)
     {
         // temp1W32 in Q27
         temp1W32 = WEBRTC_SPL_LSHIFT_W32((int32_t)A_hi[i], 16)
                 + WEBRTC_SPL_LSHIFT_W32((int32_t)A_low[i], 1);
         // Round and store upper word
         A[i] = (int16_t)(((temp1W32 << 1) + 32768) >> 16);
     }
     return 1; // Stable filters
 }