libvpx: Pull from upstream

source/libvpx/vp9/encoder/vp9_writer.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.
  */
 
 #include <assert.h>
 #include "vp9/encoder/vp9_writer.h"
 #include "vp9/common/vp9_entropy.h"
 
 void vp9_start_encode(vp9_writer *br, uint8_t *source) {
   br->lowvalue = 0;
   br->range    = 255;
-  br->value    = 0;
   br->count    = -24;
   br->buffer   = source;
   br->pos      = 0;
   vp9_write_bit(br, 0);
 }
 
 void vp9_stop_encode(vp9_writer *br) {
   int i;
 
   for (i = 0; i < 32; i++)
     vp9_write_bit(br, 0);
 
   // Ensure there's no ambigous collision with any index marker bytes
   if ((br->buffer[br->pos - 1] & 0xe0) == 0xc0)
     br->buffer[br->pos++] = 0;
 }