Remove unnecessary INSIST() in code

diff --git a/lib/ns/query.c b/lib/ns/query.c
index 6f8df29dce..e9f0590f07 100644
--- a/lib/ns/query.c
+++ b/lib/ns/query.c
@@ -3882,8 +3882,8 @@ rpz_rewrite(ns_client_t *client, dns_rdatatype_t qtype,
                st->popt = popt;
                st->rpz_ver = rpz_ver;
                client->query.rpz_st = st;
-               if (popt.dnsrps_enabled) {
 #ifdef USE_DNSRPS
+               if (popt.dnsrps_enabled) {
                        if (st->rpsdb != NULL) {
                                dns_db_detach(&st->rpsdb);
                        }
@@ -3898,10 +3898,8 @@ rpz_rewrite(ns_client_t *client, dns_rdatatype_t qtype,
                                st->m.policy = DNS_RPZ_POLICY_ERROR;
                                return (ISC_R_SUCCESS);
                        }
-#else
-                       INSIST(0);
-#endif
                }
+#endif
        }
 
        /*