avcodec/ffv1enc: silence warning about deprecated coded_frame

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: James Almer <jamrial@gmail.com>

libavcodec/ffv1enc.c

@@ -1289,7 +1289,11 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
     av_frame_unref(p);
     if ((ret = av_frame_ref(p, pict)) < 0)
         return ret;
+#if FF_API_CODED_FRAME
+FF_DISABLE_DEPRECATION_WARNINGS
     avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
+FF_ENABLE_DEPRECATION_WARNINGS
+#endif
 
     if (avctx->gop_size == 0 || f->picture_number % avctx->gop_size == 0) {
         put_rac(c, &keystate, 1);