libvpx: Pull from upstream

source/libvpx/vp8/decoder/dboolhuff.c

 /*
  *  Copyright (c) 2010 The WebM 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 29 matching lines @@
     VP8_BD_VALUE value = br->value;
     int count = br->count;
     int shift = VP8_BD_VALUE_SIZE - 8 - (count + 8);
     size_t bytes_left = br->user_buffer_end - bufptr;
     size_t bits_left = bytes_left * CHAR_BIT;
     int x = (int)(shift + CHAR_BIT - bits_left);
     int loop_end = 0;
     unsigned char decrypted[sizeof(VP8_BD_VALUE) + 1];
 
     if (br->decrypt_cb) {
-        int n = bytes_left > sizeof(decrypted) ? sizeof(decrypted) : bytes_left;
-        br->decrypt_cb(br->decrypt_state, bufptr, decrypted, n);
+        size_t n = bytes_left > sizeof(decrypted) ? sizeof(decrypted) : bytes_left;
+        br->decrypt_cb(br->decrypt_state, bufptr, decrypted, (int)n);
         bufptr = decrypted;
     }
 
     if(x >= 0)
     {
         count += VP8_LOTS_OF_BITS;
         loop_end = x;
     }
 
     if (x < 0 || bits_left)
     {
         while(shift >= loop_end)
         {
             count += CHAR_BIT;
             value |= (VP8_BD_VALUE)*bufptr << shift;
             ++bufptr;
             ++br->user_buffer;
             shift -= CHAR_BIT;
         }
     }
 
     br->value = value;
     br->count = count;
 }