gpg: Rename the struct card_key_info_s.
* g10/call-agent.h (struct card_key_info_s): Rename to ... (struct keypair_info_s): this. (keypair_info_t): New. Use this everywhere instead of card_key_info_s. * g10/call-agent.c (agent_scd_free_keyinfo): Rename to .. (free_keypair_info): this. Change all callers.
The struct is also useful to store the data from KEYPAIRINFO status
lines. Thus renaming it makes sense. A future patch will extend the
struct.
- Signed-off-by: Werner Koch <wk@gnupg.org>