md_list_add
md_list_add(&niface->auth_md_list,
void md_list_add(struct auth_md_head *, u_int8_t, char *);
md_list_add(&defs->md_list, $2, $3);
if (md_list_add(&defs->md_list, $2, $3) == -1) {
int md_list_add(struct auth_md_head *, u_int8_t, char *);