some const

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@11774 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavcodec/svq1dec.c

@@ -641,7 +641,7 @@ static int svq1_decode_frame_header (GetBitContext *bitbuf,MpegEncContext *s) {
 
 static int svq1_decode_frame(AVCodecContext *avctx,
                              void *data, int *data_size,
-                             uint8_t *buf, int buf_size)
+                             const uint8_t *buf, int buf_size)
 {
   MpegEncContext *s=avctx->priv_data;
   uint8_t        *current, *previous;