card: Print the key's label if available.
* tools/gpg-card.h (struct key_info_s): Add field 'label'. * tools/card-call-scd.c (learn_status_cb): Parse KEY-LABEL. (scd_learn): Always request KEY-LABEL. * tools/gpg-card.c (nullnone): New. (list_one_kinfo, list_card): Use it. Print the label.
PKCS#15 defines label which help to understand for what a key is
intended. Print them.
- Signed-off-by: Werner Koch <firstname.lastname@example.org>