Match existing type usage better.

webrtc/common_audio/signal_processing/complex_fft.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 163 matching lines @@
     l = 1;
     k = 10 - 1; /* Constant for given kSinTable1024[]. Do not change
          depending on the input parameter 'stages' */
 
     while (l < n)
     {
         // variable scaling, depending upon data
         shift = 0;
         round2 = 8192;
 
-        tmp32 = (int32_t)WebRtcSpl_MaxAbsValueW16(frfi, 2 * n);
+        tmp32 = WebRtcSpl_MaxAbsValueW16(frfi, 2 * n);
         if (tmp32 > 13573)
         {
             shift++;
             scale++;
             round2 <<= 1;
         }
         if (tmp32 > 27146)
         {
             shift++;
             scale++;
@@ skipping 93 matching lines @@
                         (qi32 + ti32 + round2) >> (shift + CIFFTSFT));
                 }
             }
 
         }
         --k;
         l = istep;
     }
     return scale;
 }