`efivar -l` fails on UEFI booted 11.4-RELEASE

[Yasuhiro KIMURA]

On UEFI booted 11.4-RELEASE system `efivar -l` fails as following.

root at rolling-vm-freebsd3[160]# uname -a
FreeBSD rolling-vm-freebsd3.home.utahime.org 11.4-RELEASE FreeBSD 11.4-RELEASE #0 r362094: Fri Jun 12 18:27:15 UTC 2020     root at releng2.nyi.freebsd.org:/usr/obj/usr/src/sys/GENERIC  amd64
root at rolling-vm-freebsd3[161]# efivar -l
efivar: Error listing names: No such file or directory
root at rolling-vm-freebsd3[162]#

It also happens with latest (20200625) 11-STABLE snapshot, but not
with either 12.1-RELEASE or 13-CURRENT.

---
Yasuhiro KIMURA