service: Silence compiler warning when configured without --enable-debug
diff --git a/src/service.c b/src/service.c
index db529bb..0928bcd 100644
--- a/src/service.c
+++ b/src/service.c
@@ -94,7 +94,7 @@
 	lockdownd_error_t lerr = lockdownd_start_service(lckd, service_name, &service);
 	lockdownd_client_free(lckd);
 
-	if (!service || service->port == 0) {
+	if (lerr != LOCKDOWN_E_SUCCESS) {
 		debug_info("Could not start service %s: %s", service_name, lockdownd_strerror(lerr));
 		return SERVICE_E_START_SERVICE_ERROR;
 	}