pkcs11: ignore login error when traversing tokens

pkcs11: ignore login error when traversing tokens

If a token is a general access device, it is expected that login
attempt to that token returns error:
https://github.com/p11-glue/p11-kit/blob/master/trust/module.c#L852

On the other hand, _pkcs11_traverse_tokens treats the error as fatal
and stops iteration.  This behavior prevents object search without
token specifier if such tokens are registered in the system.

Reported by Stanislav Zidek in
https://bugzilla.redhat.com/show_bug.cgi?id=1705478

Signed-off-by: Daiki Ueno <dueno@redhat.com>