def keylist_end
      err = GPGME::gpgme_op_keylist_end(self)
      exc = GPGME::error_to_exception(err)
      raise exc if exc
    end
def keylist_end
      err = GPGME::gpgme_op_keylist_end(self)
      exc = GPGME::error_to_exception(err)
      raise exc if exc
    end
End a pending key list operation.

 Used by {GPGME::Ctx#each_key}