[PATCH v3] nptl: Deallocate the thread stack on setup failure (BZ #19511)

[Florian Weimer]

* Adhemerval Zanella via Libc-alpha:

> I think it should be safe to use on code that won't be used for atomic
> operations.  The this specific flag, for instance, is protected by
> the PD lock.

Right, the atomics limitation does not seem to apply in this case.

Thanks,
Florian