* g10/keydb.c (internal_keydb_update_keyblock): Caller should lock the
resource by keydb_lock, before use of this routine.
(internal_keydb_insert_keyblock): Likewise.
(internal_keydb_delete_keyblock): Likewise.
* g10/delkey.c (do_delete_key): Serialize the access to the resource.
* g10/import.c (import_revoke_cert): Likewise.
* g10/keyedit.c (quick_find_keyblock): Likewise.
* g10/keygen.c (quick_find_keyblock): Likewise.
* sm/delete.c (delete_one): Lock earlier to protect the resource
correctly.
* sm/keydb.c (do_set_flags): Rename from keydb_set_flags.
(keydb_set_cert_flags): Follow the change.
(keydb_update_cert): Require locked by caller.
* sm/keydb.h (keydb_set_flags): Remove.