router: fix logic inversion

diff --git a/src/router.c b/src/router.c
index e3a9aa9..fada62b 100644 (file)
--- a/src/router.c
+++ b/src/router.c
@@ -321,7 +321,7 @@ static uint64_t send_router_advert(struct interface *iface, const struct in6_add
                }
        }
 
-       if (maxvalid && !iface->default_router && adv.h.nd_ra_router_lifetime) {
+       if (!maxvalid && !iface->default_router && adv.h.nd_ra_router_lifetime) {
                syslog(LOG_WARNING, "A default route is present but there is no public prefix "
                                "on %s thus we don't announce a default route!", iface->ifname);
                adv.h.nd_ra_router_lifetime = 0;