libvpx: Pull from upstream

source/libvpx/vp9/common/vp9_seg_common.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 58 matching lines @@
 
   seg->feature_data[segment_id][feature_id] = seg_data;
 }
 
 int vp9_get_segdata(const struct segmentation *seg, int segment_id,
                     SEG_LVL_FEATURES feature_id) {
   return seg->feature_data[segment_id][feature_id];
 }
 
 
-const vp9_tree_index vp9_segment_tree[14] = {
+const vp9_tree_index vp9_segment_tree[TREE_SIZE(MAX_SEGMENTS)] = {
   2,  4,  6,  8, 10, 12,
   0, -1, -2, -3, -4, -5, -6, -7
 };
 
 
 // TBD? Functions to read and write segment data with range / validity checking