scd: Fail when no good algorithm attribute.
* scd/app-openpgp.c (parse_algorithm_attribute): Return the error. (change_keyattr): Follow the change. (app_select_openpgp): Handle the error of parse_algorithm_attribute.
This change allows following invocation of app_select_openpgp, which
may work well (if the problem is device side for initial connection).
- GnuPG-bug-id: T5963
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>