constraint_byid
if ((cstr = constraint_byid(id)) != NULL) {
if ((cstr = constraint_byid(id)) == NULL) {
constraint_byid(u_int32_t);
if ((cstr = constraint_byid(id)) == NULL) {
if ((cstr = constraint_byid(id)) == NULL) {
if ((cstr = constraint_byid(id)) == NULL) {
if ((cstr = constraint_byid(id)) == NULL) {