libvpx: Pull from upstream

source/libvpx/vp9/decoder/vp9_decoder.c

Index: source/libvpx/vp9/decoder/vp9_decoder.c
===================================================================
--- source/libvpx/vp9/decoder/vp9_decoder.c	(revision 278984)
+++ source/libvpx/vp9/decoder/vp9_decoder.c	(working copy)
@@ -211,11 +211,8 @@
   }
 
   cm->frame_to_show = get_frame_new_buffer(cm);
+  cm->frame_bufs[cm->new_fb_idx].ref_count--;
 
-  if (!pbi->frame_parallel_decode || !cm->show_frame) {
-    --cm->frame_bufs[cm->new_fb_idx].ref_count;
-  }
-
   // Invalidate these references until the next frame starts.
   for (ref_index = 0; ref_index < 3; ref_index++)
     cm->frame_refs[ref_index].idx = INT_MAX;
@@ -243,9 +240,7 @@
   }
 
   // Check if the previous frame was a frame without any references to it.
-  // Release frame buffer if not decoding in frame parallel mode.
-  if (!pbi->frame_parallel_decode && cm->new_fb_idx >= 0 &&
-         cm->frame_bufs[cm->new_fb_idx].ref_count == 0)
+  if (cm->new_fb_idx >= 0 && cm->frame_bufs[cm->new_fb_idx].ref_count == 0)
     cm->release_fb_cb(cm->cb_priv,
                       &cm->frame_bufs[cm->new_fb_idx].raw_frame_buffer);
   cm->new_fb_idx = get_free_fb(cm);