convert all log_error_write() to log_error() and pass (log_error_st *)
use con->errh in preference to srv->errh (even though currently same)
avoid passing (server *) when previously used only for logging (errh)
getaddrinfo() should return non-empty result list (res)
or else should return EAI_NONAME or some other error
(musl C library does not check for NULL argument to freeaddrinfo())
"Segmentation fault in mod_extforward with libmusl"