worker: mark new UDP fd received as UDP data reception time

That prevents errors such as switching to TCP when no UDP packets
are received immediatelly after connection establishment.

Signed-off-by: Nikos Mavrogiannopoulos <nmav@gnutls.org>

src/worker-misc.c

@@ -154,6 +154,8 @@ int handle_commands_from_main(struct worker_st *ws)
 				set_mtu_disc(fd, ws->proto, 0);
 
 			oclog(ws, LOG_DEBUG, "received new UDP fd and connected to peer");
+			ws->udp_recv_time = time(0);
+
 			return 0;
 
 			}