fix test-http-parse-error.lua to be a little more concise
fix test-http-parse-error.lua to be a little more concise

* fixes the test on windows

sousoux/luvit,sousoux/luvit,sousoux/luvit,bsn069/luvit,GabrielNicolasAvellaneda/luvit-upstream,bsn069/luvit,boundary/luvit,boundary/luvit,sousoux/luvit,luvit/luvit,sousoux/luvit,boundary/luvit,luvit/luvit,kaustavha/luvit,GabrielNicolasAvellaneda/luvit-upstream,kaustavha/luvit,rjeli/luvit,DBarney/luvit,boundary/luvit,sousoux/luvit,zhaozg/luvit,rjeli/luvit,GabrielNicolasAvellaneda/luvit-upstream,rjeli/luvit,GabrielNicolasAvellaneda/luvit-upstream,bsn069/luvit,zhaozg/luvit,kaustavha/luvit,rjeli/luvit,DBarney/luvit,DBarney/luvit,DBarney/luvit,boundary/luvit,boundary/luvit