ossl_cmp_hdr_set1_sender
if (!ossl_cmp_hdr_set1_sender(hdr, sender))
int ossl_cmp_hdr_set1_sender(OSSL_CMP_PKIHEADER *hdr, const X509_NAME *nm);
if (!TEST_int_eq(ossl_cmp_hdr_set1_sender(fixture->hdr, x509name), 1))
|| !ossl_cmp_hdr_set1_sender(fixture->msg->header, NULL)