Remove $DISPSERIALNO support.
* src/agent.h (struct agent_card_info_s): Remove dispserialno. * src/agent.c (scute_agent_release_card_info): Remove freeing dispserialno. (learn_status_cb): Remove filling dispserialno. (scute_agent_learn): Don't ask scdaemon for $DISPSERIALNO. * src/slots.c (slot_token_serial): Simply use info.serialno.
This is the start of changes to KEYGRIP centric method. We will
identify a key by KEYGRIP to support multiple keys simultaneously.
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>