ffv1: Drop unnecessary casts and const qualifiers to match function signatures

libavcodec/ffv1dec.c:898:36: warning: cast discards ‘const’ qualifier from pointer target type

libavcodec/ffv1dec.c

@@ -827,13 +827,13 @@ static av_cold int ffv1_decode_init(AVCodecContext *avctx)
 static int ffv1_decode_frame(AVCodecContext *avctx, void *data,
                              int *got_frame, AVPacket *avpkt)
 {
-    const uint8_t *buf  = avpkt->data;
+    uint8_t *buf        = avpkt->data;
     int buf_size        = avpkt->size;
     FFV1Context *f      = avctx->priv_data;
     RangeCoder *const c = &f->slice_context[0]->c;
     int i, ret;
     uint8_t keystate = 128;
-    const uint8_t *buf_p;
+    uint8_t *buf_p;
     AVFrame *const p    = data;
 
     f->cur = p;
@@ -895,7 +895,7 @@ static int ffv1_decode_frame(AVCodecContext *avctx, void *data,
         if (i) {
             ff_init_range_decoder(&fs->c, buf_p, v);
         } else
-            fs->c.bytestream_end = (uint8_t *)(buf_p + v);
+            fs->c.bytestream_end = buf_p + v;
 
         fs->cur = p;
     }
@@ -919,7 +919,7 @@ static int ffv1_decode_frame(AVCodecContext *avctx, void *data,
                          f->last_picture->linesize[j] *
                          (fs->slice_y >> sv) + (fs->slice_x >> sh);
             }
-            av_image_copy(dst, p->linesize, (const uint8_t **)src,
+            av_image_copy(dst, p->linesize, src,
                           f->last_picture->linesize,
                           avctx->pix_fmt, fs->slice_width,
                           fs->slice_height);