Fix crash in DNS due to sign extension
Fix crash in balloc.
Fix DNS crash.

The result list is owned by the called once dr_fn() is called, so don't
try to free it after that (as the caller already might have).
Disable balloc for now.
Defer calls to the connect done handler using net_soon.
Useless server_wants_article() removed; formatting.
Rewrite of feeder code.