replace /* fall through */ comment with __attribute_fallthrough__ macro
Note: not adding attribute to code with external origins:
xxhash.h (algo_xxhash.h)
ls-hpack/lshpack.c
so to avoid warnings, may need to compile with -Wno-implicit-fallthrough
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())
x-ref:
"Segmentation fault in mod_extforward with libmusl"
https://redmine.lighttpd.net/issues/2984
Glenn Strauss