Threading decoding errors with fate-vp9-16-intra-only test

[James]

make fate-vp9-16-intra-only THREADS=8

ffmpeg version N-71798-gd2184bf Copyright (c) 2000-2015 the FFmpeg developers
  built with gcc 4.9.2 (GCC) 20150304 (prerelease)
  configuration: --prefix=/home/ux/fate/x86_64-archlinux-gcc-threads-8/install --samples=/home/ux/fate/fate-suite --enable-gpl --enable-memory-poisoning --enable-avresample --cc='ccache cc'
  libavutil      54. 23.101 / 54. 23.101
  libavcodec     56. 35.101 / 56. 35.101
  libavformat    56. 31.100 / 56. 31.100
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 14.100 /  5. 14.100
  libavresample   2.  1.  0 /  2.  1.  0
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  3.100 / 53.  3.100
Input #0, matroska,webm, from '/home/ux/fate/fate-suite/vp9-test-vectors/vp90-2-16-intra-only.webm':
  Metadata:
    encoder         : libwebm-0.2.1.0
  Duration: 00:00:00.30, start: 0.133000, bitrate: 4688 kb/s
    Stream #0:0(eng): Video: vp9, yuv420p, 352x288, SAR 1:1 DAR 11:9, 29.92 tbr, 1k tbn, 1k tbc (default)
Output #0, framemd5, to 'pipe:':
    Stream #0:0(eng): Video: rawvideo (I420 / 0x30323449), yuv420p, 352x288 [SAR 1:1 DAR 11:9], q=2-31, 200 kb/s, 29.92 fps, 29.92 tbn, 29.92 tbc (default)
    Metadata:
      encoder         : Lavc rawvideo
Stream mapping:
  Stream #0:0 -> #0:0 (vp9 (native) -> rawvideo (native))
Press [q] to stop, [?] for help
[vp9 @ 0x2c13120] Requested reference 1 not available
[vp9 @ 0x2c17120] Requested reference 0 not available
[vp9 @ 0x2c6f4c0] Not all references are available
[vp9 @ 0x2c27e60] Not all references are available
frame=    3 fps=0.0 q=0.0 Lsize=       0kB time=00:00:00.10 bitrate=  28.2kbits/s    
video:446kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown


--- /home/ux/fate/ffmpeg/tests/ref/fate/vp9-16-intra-only	2015-04-24 19:06:06.548235437 +0200
+++ tests/data/fate/vp9-16-intra-only	2015-04-30 07:38:05.766543031 +0200
@@ -6,5 +6,3 @@
 0,          0,          0,        1,   152064, d57529601178948afa4818c3c8938884
 0,          1,          1,        1,   152064, d47e00250c45733d64af067a417bcd06
 0,          2,          2,        1,   152064, 984e41cd8350808ac6129746b2377818
-0,          4,          4,        1,   152064, 76ba63001170b8992fc72be5c4ace731
-0,          5,          5,        1,   152064, c4e7f96a8fd58d901b1d881926ddae09

[James]

Fixed in 5935513c0ed1563a654b2e40d053f824bae93e6b