expect_continuation_of_headers efficiency fix
expect_continuation_of_headers efficiency fix

If a frame is going to make the request exceed H2O_MAX_REQLEN, avoid
allocating the memory for it, and reject the stream right away, instead
of doing the alloc and memcpy.

cwyang/h2o,lkwg82/h2o,cwyang/h2o,rayrapetyan/h2o,zlm2012/h2o,cwyang/h2o,yannick/h2o,zlm2012/h2o,h2o/h2o,cubicdaiya/h2o,i110/h2o,deweerdt/h2o,cubicdaiya/h2o,h2o/h2o,i110/h2o,h2o/h2o,h2o/h2o,deweerdt/h2o,rayrapetyan/h2o,devnexen/h2o,yannick/h2o,h2o/h2o,yannick/h2o,deweerdt/h2o,zlm2012/h2o,deweerdt/h2o,cubicdaiya/h2o,rayrapetyan/h2o,lkwg82/h2o,lkwg82/h2o,rayrapetyan/h2o,lkwg82/h2o,devnexen/h2o,i110/h2o,cubicdaiya/h2o,cubicdaiya/h2o,cwyang/h2o,rayrapetyan/h2o,yannick/h2o,cubicdaiya/h2o,cwyang/h2o,zlm2012/h2o,rayrapetyan/h2o,yannick/h2o,yannick/h2o,h2o/h2o,h2o/h2o,h2o/h2o,lkwg82/h2o,cwyang/h2o,i110/h2o,deweerdt/h2o,deweerdt/h2o,deweerdt/h2o,i110/h2o,i110/h2o,i110/h2o,devnexen/h2o,lkwg82/h2o,h2o/h2o,cubicdaiya/h2o,cwyang/h2o,rayrapetyan/h2o,zlm2012/h2o,devnexen/h2o,yannick/h2o,lkwg82/h2o,zlm2012/h2o,devnexen/h2o,i110/h2o,cwyang/h2o,devnexen/h2o,deweerdt/h2o,devnexen/h2o,zlm2012/h2o,rayrapetyan/h2o,zlm2012/h2o,yannick/h2o,lkwg82/h2o,deweerdt/h2o,cubicdaiya/h2o,yannick/h2o,devnexen/h2o,rayrapetyan/h2o,i110/h2o,i110/h2o,lkwg82/h2o,zlm2012/h2o,rayrapetyan/h2o,devnexen/h2o