one "cast discards qualifiers from pointer target type" less

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@11709 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavcodec/utils.c

@@ -1000,7 +1000,7 @@ int avcodec_decode_subtitle(AVCodecContext *avctx, AVSubtitle *sub,
 
     *got_sub_ptr = 0;
     ret = avctx->codec->decode(avctx, sub, got_sub_ptr,
-                               (uint8_t *)buf, buf_size);
+                               buf, buf_size);
     if (*got_sub_ptr)
         avctx->frame_number++;
     return ret;