"ssh-keygen -R hostname" errors out with non-existent known_hosts

[Damien Miller]

On Wed, 24 Mar 2021, Thorsten Glaser wrote:

> On Tue, 23 Mar 2021, Noah Zalev wrote:
> 
> > It may be a success according to your semantics in this instance, but
> > what about in cases where the known_host file *should* have been
> > found, but wasn't?
> 
> What do you care?

Because known_hosts not existing is an abnormal condition for a tool
that is asked to modify known_hosts.