connection.c: muted compiler warnings, replaced some unused checks with asserts.
connection.c: muted compiler warnings, replaced some unused checks with asserts.

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