checksum threshold removial

Originally committed as revision 2992 to svn://svn.ffmpeg.org/ffmpeg/trunk

tests/libav.regression.ref

@@ -22,8 +22,8 @@ f13889dd08a4968e2b783771c7a29229 *./data/b-libav.ffm
 c5cfe6177bc495372585e5e9c63f3e64 *./data/b-libav.mov
  365341 ./data/b-libav.mov
 ./data/b-libav.mov CRC=1bd6add1
-5310f69514c9c38bebbcaf89e507c516 *./data/b-libav.nut
-327790 ./data/b-libav.nut
+f6df4c2011d754b14a67d879b15401b8 *./data/b-libav.nut
+327789 ./data/b-libav.nut
 ./data/b-libav.nut CRC=658838d9
 9a9da315747599f7718cc9a9a09c21ff *./data/b-libav.pbm
  317075 ./data/b-libav.pbm