agent: Supply GRIP=NULL for agent_key_from_file, for real use.
* agent/findkey.c (agent_key_from_file): Change the semantics of GRIP. Now, it's NULL for use by PKDECRYPT and PKSIGN/PKAUTH. * agent/pkdecrypt.c (agent_pkdecrypt): Set GRIP=NULL. * agent/pksign.c (agent_pksign_do): Likewise.
- GnuPG-bug-id: T5099
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>