libvpx: Pull from upstream

source/libvpx/vpx_scale/generic/yv12config.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 181 matching lines @@
       if (external_frame_size != (size_t)external_frame_size)
         return -1;
 
       // Allocation to hold larger frame, or first allocation.
       if (cb(cb_priv, (size_t)external_frame_size, fb) < 0)
         return -1;
 
       if (fb->data == NULL || fb->size < external_frame_size)
         return -1;
 
-      // This memset is needed for fixing valgrind error from C loop filter
-      // due to access uninitialized memory in frame border. It could be
-      // removed if border is totally removed.
-      vpx_memset(fb->data, 0, fb->size);
-
       ybf->buffer_alloc = (uint8_t *)yv12_align_addr(fb->data, 32);
     } else if (frame_size > (size_t)ybf->buffer_alloc_sz) {
       // Allocation to hold larger frame, or first allocation.
       vpx_free(ybf->buffer_alloc);
       ybf->buffer_alloc = NULL;
 
       if (frame_size != (size_t)frame_size)
         return -1;
 
       ybf->buffer_alloc = (uint8_t *)vpx_memalign(32, (size_t)frame_size);
@@ skipping 81 matching lines @@
     vp9_free_frame_buffer(ybf);
     return vp9_realloc_frame_buffer(ybf, width, height, ss_x, ss_y,
 #if CONFIG_VP9_HIGHBITDEPTH
                                     use_highbitdepth,
 #endif
                                     border, NULL, NULL, NULL);
   }
   return -2;
 }
 #endif