remove some warnings due to avctx->execute

Originally committed as revision 16909 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/dv.c

@@ -507,9 +507,10 @@ static inline void dv_calculate_mb_xy(DVVideoContext *s, DVwork_chunk *work_chun
 }
 
 /* mb_x and mb_y are in units of 8 pixels */
-static int dv_decode_video_segment(AVCodecContext *avctx, DVwork_chunk *work_chunk)
+static int dv_decode_video_segment(AVCodecContext *avctx, void *arg)
 {
     DVVideoContext *s = avctx->priv_data;
+    DVwork_chunk *work_chunk = arg;
     int quant, dc, dct_mode, class1, j;
     int mb_index, mb_x, mb_y, last_index;
     int y_stride, linesize;
@@ -994,9 +995,10 @@ static inline void dv_guess_qnos(EncBlockInfo* blks, int* qnos)
     }
 }
 
-static int dv_encode_video_segment(AVCodecContext *avctx, DVwork_chunk *work_chunk)
+static int dv_encode_video_segment(AVCodecContext *avctx, void *arg)
 {
     DVVideoContext *s = avctx->priv_data;
+    DVwork_chunk *work_chunk = arg;
     int mb_index, i, j;
     int mb_x, mb_y, c_offset, linesize, y_stride;
     uint8_t*  y_ptr;