-fix theoretical overflow issue reported by Florian Weimer
-fix theoretical overflow issue reported by Florian Weimer

maru/libmicrohttpd-http2,maru/libmicrohttpd-http2,maru/libmicrohttpd-http2,ghaderer/libmicrohttpd,ghaderer/libmicrohttpd,ghaderer/libmicrohttpd