mlpdec: Comment channel_params field in struct SubStream.

Patch by Nick Brereton <nick at nbrereton dot net>

backport r23085 by ramiro


Originally committed as revision 23216 to svn://svn.ffmpeg.org/ffmpeg/branches/0.6

libavcodec/mlpdec.c

@@ -62,6 +62,7 @@ typedef struct SubStream {
     //! For each channel output by the matrix, the output channel to map it to
     uint8_t     ch_assign[MAX_CHANNELS];
 
+    //! Channel coding parameters for channels in the substream
     ChannelParams channel_params[MAX_CHANNELS];
 
     //! The left shift applied to random noise in 0x31ea substreams.