nat_get_cmd
if (nat_get_cmd(cfg->name, nla->cmd, &oh) != 0) {
if (nat_get_cmd(cfg->name, nla->cmd, &oh) == 0) {
if (nat_get_cmd(name, cmd, &oh) != 0)
static int nat_get_cmd(char *name, uint16_t cmd, ipfw_obj_header **ooh);