vacl_get_acl
error = vacl_get_acl(l, fp->f_vnode, SCARG(uap, type),
error = vacl_get_acl(l, path_vp, type, aclp);
error = vacl_get_acl(l, fp->f_vnode, SCARG(uap, type),
int vacl_get_acl(struct lwp *, struct vnode *, acl_type_t, struct acl *);