g10: Minor fixes.
* g10/export.c (cleartext_secret_key_to_openpgp): No initialization. (do_export_one_keyblock): Initialize with GPG_ERR_NOT_FOUND. * g10/getkey.c (get_best_pubkey_byname): Add non-null check. * g10/tofu.c (tofu_set_policy): ERR initialize to 0.
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>