[GPGME] statefulness of gpgme_op_keylist_*

[Daiki Ueno]

>>>>> In <87hcy13e5q.fsf at wheatstone.g10code.de> 
>>>>>	Werner Koch <wk at gnupg.org> wrote:
> > Though this behavior might be intentional, may I request to change it to
> > return an error (possibly GPG_ERR_INV_STATE?) on 1 rather than SEGV?

> Sure. http://bugs.gnupg.org/715

I confirmed Marcus' fix of this issue.  Thanks.
https://bugs.g10code.com/gnupg/msg1794

By the way, a similar change would be needed for trustlist_next?

Regards,
-- 
Daiki Ueno