libvpx: Pull from upstream

source/libvpx/vp8/decoder/decodemv.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 573 matching lines @@
                 (unsigned char)(2 + vp8_read(r, x->mb_segment_tree_probs[2]));
         else
             mi->segment_id =
                 (unsigned char)(vp8_read(r, x->mb_segment_tree_probs[1]));
     }
 }
 
 static void decode_mb_mode_mvs(VP8D_COMP *pbi, MODE_INFO *mi,
                                MB_MODE_INFO *mbmi)
 {
+    (void)mbmi;
+
     /* Read the Macroblock segmentation map if it is being updated explicitly
      * this frame (reset to 0 above by default)
      * By default on a key frame reset all MBs to segment 0
      */
     if (pbi->mb.update_mb_segmentation_map)
         read_mb_features(&pbi->mbc[8], &mi->mbmi, &pbi->mb);
     else if(pbi->common.frame_type == KEY_FRAME)
         mi->mbmi.segment_id = 0;
 
     /* Read the macroblock coeff skip flag if this feature is in use,
@@ skipping 55 matching lines @@
             pbi->mb.mb_to_left_edge -= (16 << 3);
             pbi->mb.mb_to_right_edge -= (16 << 3);
             mi++;       /* next macroblock */
         }
         pbi->mb.mb_to_top_edge -= (16 << 3);
         pbi->mb.mb_to_bottom_edge -= (16 << 3);
 
         mi++;           /* skip left predictor each row */
     }
 }