* g10/keydb.c (keydb_new): Print an error message if needed.  Also use
xtrycalloc because we return an error anyway.
* g10/delkey.c (do_delete_key): Handle error retruned by keydb_new.
* g10/export.c (do_export_stream): Ditto.
* g10/getkey.c (get_pubkey): Ditto.
(get_pubkey_fast): Ditto.
(get_pubkeyblock): Ditto.
(get_seckey): Ditto.
(key_byname): Ditto.
(get_pubkey_byfprint): Ditto.
(get_pubkey_byfprint_fast): Ditto.
(parse_def_secret_key): Ditto.
(have_secret_key_with_kid): Ditto.
* g10/import.c (import_one): Ditto.
(import_revoke_cert): Ditto.
* g10/keyedit.c (keyedit_quick_adduid): Ditto.
* g10/keygen.c (quick_generate_keypair): Ditto.
(do_generate_keypair): Ditto.
* g10/trustdb.c (validate_keys): Ditto.
* g10/keyserver.c (keyidlist): Ditto.
* g10/revoke.c (gen_desig_revoke): Ditto.
(gen_revoke): Ditto.
* g10/gpg.c (check_user_ids): Ditto.
(main): Do not print an error message for keydb_new error.
* g10/keylist.c (list_all): Use actual error code returned by
keydb_new.
* g10/t-keydb-get-keyblock.c (do_test): Abort on keydb_new error.
* g10/t-keydb.c (do_test): Ditto.
* g10/keyring.c (keyring_new): Actually return an error so that the
existing keydb_new error checking makes sense for a keyring resource.
(keyring_rebuild_cache): Take care of keyring_new returning an error.