This is the second patch for MBAFF support, this adds the deblocking

filter code for the I slice.

With this patch, 4 more frames are decoded correctly from the
conformance streams.
patch by (Loïc Le Loarer <lll+ffmpeg m4x org>)


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@4088 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b