DEGRADED/DOWN paths are useless server side

Signed-off-by: Adrien Gallouët <adrien@gallouet.fr>

mud.c

@@ -1467,7 +1467,8 @@ mud_update(struct mud *mud, uint64_t now)
             if ((path->msg_sent >= MUD_MSG_SENT_MAX) ||
                 (path->recv.time &&
                  mud->last_recv_time > path->recv.time + MUD_ONE_SEC)) {
-                mud_reset_path(mud, path);
+                path->state = MUD_EMPTY;
+                continue;
             }
         }