[LTP] [PATCH 2/3] syscalls/pipe02: Cleanup && convert to new API

[Cyril Hrubis]

Hi!
Pushed with minor changes, thanks.

* The SAFE_FORK() cannot fail

* Used checkpoints for synchronization instead of SIGUSR1

* Report failure if child wasn't signaled

-- 
Cyril Hrubis
chrubis@suse.cz