ossl_quic_rstream_available
int ossl_quic_rstream_available(QUIC_RSTREAM *qrs, size_t *avail, int *fin);
if (!ossl_quic_rstream_available(s->rstream, &avail, &fin))
if (!ossl_quic_rstream_available(rstream, &avail, &is_fin))
&& ossl_quic_rstream_available(xso->stream->rstream, &avail, &fin)
&& !ossl_quic_rstream_available(stream->rstream, &rs_avail, &rs_fin)) {
|| !TEST_true(ossl_quic_rstream_available(rstream, &avail, &fin))