delv 9.16.0, failed to add trusted key '.': ran out of space

[Shaun]

Hi,

The 9.16.0 version of delv seems to have trouble reading the root trust
anchor from the bind.keys file. I'm seeing this in multiple environments,
CentOS 6.10 and FreeBSD 11.3:

[user at host ~]$ delv -v
delv 9.16.0
[user at host ~]$ delv isc.org
;; /etc/bind.keys:31: failed to add trusted key '.': ran out of space
;; setup_dnsseckeys: failure

Attempting to rule out a problem with my local bind.keys, I grabbed a
fresh copy, but delv produces the same output:

[user at host ~]$ wget -qO /tmp/bind.keys.916 https://gitlab.isc.org/isc-projects/bind9/raw/v9_16/bind.keys
[user at host ~]$ delv -a /tmp/bind.keys.916 isc.org
;; /tmp/bind.keys.916:31: failed to add trusted key '.': ran out of space
;; setup_dnsseckeys: failure

The above output is from CentOS but the behavior is identical on FreeBSD.
Has anyone observed delv 9.16.0 to work in these environments? Before
opening a bug I want to make sure I didn't goof something on my end.

Thanks,

Shaun