agent: Prepare to pass an additional parameter to the getpin callback.
* agent/call-scd.c (writekey_parm_s, inq_needpin_s): Merge into ... (inq_needpin_parm_s): new struct. Add new field 'getpin_cb_desc'. Change users to set all fields. (inq_needpin): Pass GETPIN_CB_DESC to the GETPIN_CB. (agent_card_pksign): Add arg 'desc_text' and change arg 'getpin_cb' to take an additional arg 'desc_text'. (agent_card_pkdecrypt): Ditto. (agent_card_writekey): Change arg 'getpin_cb' to take an additional arg 'desc_text'. (agent_card_scd): Ditto. * agent/divert-scd.c (getpin_cb): Add new arg 'desc_text'. (divert_pksign): Add new arg 'desc_text' and pass is to agent_card_pksign. (divert_pkdecrypt): Add new arg 'desc_text' and pass is to agent_card_pkdecrypt. * agent/pkdecrypt.c (agent_pkdecrypt): Pass DESC_TEXT to divert_pkdecrypt. * agent/pksign.c (agent_pksign_do): Pass DESC_TEXT to divert_pksign.
- Signed-off-by: Werner Koch <wk@gnupg.org>