Match existing type usage better.

webrtc/common_audio/signal_processing/auto_correlation.c

 /*
  *  Copyright (c) 2012 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 18 matching lines @@
 
   // Find the maximum absolute value of the samples.
   smax = WebRtcSpl_MaxAbsValueW16(in_vector, in_vector_length);
 
   // In order to avoid overflow when computing the sum we should scale the
   // samples so that (in_vector_length * smax * smax) will not overflow.
   if (smax == 0) {
     scaling = 0;
   } else {
     // Number of bits in the sum loop.
-    int nbits = WebRtcSpl_GetSizeInBits(in_vector_length);
+    int nbits = WebRtcSpl_GetSizeInBits((uint32_t)in_vector_length);
     // Number of bits to normalize smax.
     int t = WebRtcSpl_NormW32(WEBRTC_SPL_MUL(smax, smax));
 
     if (t > nbits) {
       scaling = 0;
     } else {
       scaling = nbits - t;
     }
   }
 
   // Perform the actual correlation calculation.
   for (i = 0; i < order + 1; i++) {
     sum = 0;
     /* Unroll the loop to improve performance. */
     for (j = 0; i + j + 3 < in_vector_length; j += 4) {
       sum += (in_vector[j + 0] * in_vector[i + j + 0]) >> scaling;
       sum += (in_vector[j + 1] * in_vector[i + j + 1]) >> scaling;
       sum += (in_vector[j + 2] * in_vector[i + j + 2]) >> scaling;
       sum += (in_vector[j + 3] * in_vector[i + j + 3]) >> scaling;
     }
     for (; j < in_vector_length - i; j++) {
       sum += (in_vector[j] * in_vector[i + j]) >> scaling;
     }
     *result++ = sum;
   }
 
   *scale = scaling;
   return order + 1;
 }