ossl_quic_sstream_mark_lost_fin
int ossl_quic_sstream_mark_lost_fin(QUIC_SSTREAM *qss);
ossl_quic_sstream_mark_lost_fin(sstream);
if (!TEST_false(ossl_quic_sstream_mark_lost_fin(info->sstream[1])))
if (!TEST_true(ossl_quic_sstream_mark_lost_fin(sstream)))