sshkey_xmss_serialize_state
if ((ret = sshkey_xmss_serialize_state(k, b)) != 0) {
r = sshkey_xmss_serialize_state(k, b);
r = sshkey_xmss_serialize_state(k, b);
if ((r = sshkey_xmss_serialize_state(k, b)) != 0)
int sshkey_xmss_serialize_state(const struct sshkey *, struct sshbuf *);