dsa_compute_pub_from_priv
ret = dsa_compute_pub_from_priv(&pub2, &priv); EG(ret, err);
ATTRIBUTE_WARN_UNUSED_RET int dsa_compute_pub_from_priv(dsa_pub_key *pub,
return dsa_compute_pub_from_priv(pub, priv);
ret = dsa_compute_pub_from_priv(pub, &priv_);
return dsa_compute_pub_from_priv(pub, priv);