Comment 0 for bug 1988055

in unbound config one of the valid ways to specify IPs to listen on is to specify an interface name. e.g.

```
server:
  interface: lan0
```

unbound starts and works correctly, but unbound-checkconf returns an error:

```
# unbound-checkconf
[1661781808] unbound-checkconf[4362:0] fatal error: cannot parse interface specified as 'lan0'
```

this bug was fixed upstream https://github.com/NLnetLabs/unbound/issues/574