avformat/utils: fix a codecpar non use

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

libavformat/utils.c

@@ -617,7 +617,7 @@ static void force_codec_ids(AVFormatContext *s, AVStream *st)
         break;
     case AVMEDIA_TYPE_DATA:
         if (s->data_codec_id)
-            st->codec->codec_id = s->data_codec_id;
+            st->codecpar->codec_id = s->data_codec_id;
         break;
     }
 }