agent: Avoid uninitialized buffer.
* agent/sexp-secret.c (fixup_when_ecc_private_key): Initialize buffer to avoid its use on unexpected inputs.
- GnuPG-bug-id: T5393
- Co-authored-by: NIIBE Yutaka <gniibe@fsij.org>
- Signed-off-by: Jakub Jelen <jjelen@redhat.com>