alacenc : cosmetics : remove misleading comment

Originally committed as revision 18493 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/alacenc.c

@@ -332,7 +332,6 @@ static void write_compressed_frame(AlacEncodeContext *s)
 {
     int i, j;
 
-    /* only simple mid/side decorrelation supported as of now */
     if(s->avctx->channels == 2)
         alac_stereo_decorrelation(s);
     put_bits(&s->pbctx, 8, s->interlacing_shift);