ossl_cmp_hdr_init
int ossl_cmp_hdr_init(OSSL_CMP_CTX *ctx, OSSL_CMP_PKIHEADER *hdr);
if (!ossl_cmp_hdr_init(ctx, msg->header)
ossl_cmp_hdr_init(fixture->cmp_ctx, fixture->hdr)))
if (!TEST_int_eq(ossl_cmp_hdr_init(fixture->cmp_ctx, fixture->hdr),