[FFmpeg-cvslog] Fix the intra_dc_precision API doc.

[Carl Eugen Hoyos]

ffmpeg | branch: master | Carl Eugen Hoyos <cehoyos at ag.or.at> | Mon Mar  9 10:47:06 2015 +0100| [b69238d9badc9cccfdb540c6faa50beaeda401a5] | committer: Carl Eugen Hoyos

Fix the intra_dc_precision API doc.

The mpegvideo decoder has set intra_dc_precision since forever.

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=b69238d9badc9cccfdb540c6faa50beaeda401a5
---

 libavcodec/avcodec.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 575dae1..a9dbff7 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -1823,7 +1823,7 @@ typedef struct AVCodecContext {
     /**
      * precision of the intra DC coefficient - 8
      * - encoding: Set by user.
-     * - decoding: unused
+     * - decoding: Set by libavcodec
      */
     int intra_dc_precision;