Remove some useless code that duplicates av_get_packet.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>

libavformat/au.c

@@ -189,10 +189,6 @@ static int au_read_packet(AVFormatContext *s,
         return ret;
     pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
     pkt->stream_index = 0;
-
-    /* note: we need to modify the packet size here to handle the last
-       packet */
-    pkt->size = ret;
     return 0;
 }