avformat/tee: Use ref instead copy in write_packet

Replace av_copy_packet and deprecated av_dup_packet by
creating reference using av_packet_ref.
Reviewed-by: Nicolas George <george@nsup.org>
Signed-off-by: Jan Sebechlebsky <sebechlebskyjan@gmail.com>
Signed-off-by: Marton Balint <cus@passwd.hu>

libavformat/tee.c

@@ -527,8 +527,8 @@ static int tee_write_packet(AVFormatContext *avf, AVPacket *pkt)
         if (s2 < 0)
             continue;
 
-        if ((ret = av_copy_packet(&pkt2, pkt)) < 0 ||
-            (ret = av_dup_packet(&pkt2))< 0)
+        memset(&pkt2, 0, sizeof(AVPacket));
+        if ((ret = av_packet_ref(&pkt2, pkt)) < 0)
             if (!ret_all) {
                 ret_all = ret;
                 continue;