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VP9: Only zero counts when !frame_parallel_decoding_mode

The counts are never used when frame_parallel_decoding_mode
is set.

Change-Id: Ic7a566a048297f7373c9ffbb48929ea09eff674f

--- a/vp9/decoder/vp9_decodeframe.c

+++ b/vp9/decoder/vp9_decodeframe.c

@@ -1979,6 +1979,8 @@

   if (!cm->error_resilient_mode) {

     cm->refresh_frame_context = vpx_rb_read_bit(rb);

     cm->frame_parallel_decoding_mode = vpx_rb_read_bit(rb);

+    if (!cm->frame_parallel_decoding_mode)

+      vp9_zero(cm->counts);

   } else {

     cm->refresh_frame_context = 0;

     cm->frame_parallel_decoding_mode = 1;

@@ -2201,8 +2203,6 @@

   if (!cm->fc->initialized)

     vpx_internal_error(&cm->error, VPX_CODEC_CORRUPT_FRAME,

                        "Uninitialized entropy context.");

-

-  vp9_zero(cm->counts);

   xd->corrupted = 0;

   new_fb->corrupted = read_compressed_header(pbi, data, first_partition_size);