gpg: Store the Tofu meta handle for databases in CTRL.
* g10/gpg.h (struct tofu_dbs_s, tofu_dbs_t): New declarations. (struct server_control_s): Add field tofu.dbs. * g10/tofu.c (struct dbs): Rename to tofu_dbs_s. Replace all users by by tofu_dbs_t. (opendbs): Add arg CTRL. Cache the DBS in CTRL. (closedbs): Rename to tofu_closedbs and make global. Add arg CTRL. (tofu_register): Add arg CTRL. Change all callers. Do not call closedbs. (tofu_get_validity): Ditto. (tofu_set_policy): Ditto. (tofu_get_policy): Ditto. (tofu_set_policy_by_keyid): Add arg CTRL. * g10/gpg.c (gpg_deinit_default_ctrl): Call tofu_closedbs.
- Signed-off-by: Werner Koch <wk@gnupg.org>