Avoid "unused variable" warning while working on send/recv error handling
Avoid "unused variable" warning while working on send/recv error handling

See also #150

GerHobbelt/civet-webserver,GerHobbelt/civet-webserver,GerHobbelt/civet-webserver,GerHobbelt/civet-webserver,GerHobbelt/civet-webserver,GerHobbelt/civet-webserver