sshkey_xmss_init
if ((r = sshkey_xmss_init(to, from->xmss_name)) != 0)
if ((ret = sshkey_xmss_init(key, xmss_name)) != 0)
(r = sshkey_xmss_init(key, xmss_name)) != 0)
if ((r = sshkey_xmss_init(k, name)) != 0 ||
int sshkey_xmss_init(struct sshkey *, const char *);