add assertion (which fails by default with openssl 3)
add assertion (which fails by default with openssl 3)

yannick/h2o,yannick/h2o,yannick/h2o,yannick/h2o,devnexen/h2o,devnexen/h2o,devnexen/h2o,devnexen/h2o,yannick/h2o,devnexen/h2o,yannick/h2o,yannick/h2o,devnexen/h2o,devnexen/h2o,h2o/h2o,h2o/h2o,h2o/h2o,devnexen/h2o,yannick/h2o,h2o/h2o,h2o/h2o,devnexen/h2o,h2o/h2o,h2o/h2o,h2o/h2o,h2o/h2o,yannick/h2o