l9p_pustat
ssize_t l9p_pustat(struct l9p_message *msg, struct l9p_stat *s,
r = l9p_pustat(msg, &fcall->rstat.stat, version);
r = l9p_pustat(msg, &fcall->twstat.stat, version);
l9p_pustat(msg, st, conn->lc_version) < 0)