r = command (NULL, &err, "/usr/sbin/zerofree", device, NULL);
if (r == -1) {
reply_with_error ("zerofree: %s: %s", device, err);
r = command (NULL, &err, "/usr/sbin/zerofree", device, NULL);
if (r == -1) {
reply_with_error ("zerofree: %s: %s", device, err);