gpg,sm: Set confidential in assuan communication for password.
* g10/call-agent.c (default_inq_cb): Call assuan_begin_confidential and assuan_end_confidential. * sm/call-agent.c (default_inq_cb): Likewise.
- GnuPG-bug-id: T6654
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>