The test on "if (err)" after parsing a number was meant to be
"if (*err)" but in practise it will always be true since we at least
have a '\n' there, so no need for testing before writing zero.
This fixes issue #1211.
The following directories were moved from contrib/ to dev/ to make their
use case a bit clearer. In short, only developers are expected to ever
go there. The makefile was updated to build and clean from these ones.
base64/ flags/ hpack/ plug_qdisc/ poll/ tcploop/ trace/