[PATCH 2/2] pthread_once: Use futex wrappers with error checking.

[Torvald Riegel]

This uses the new glibc-internal futex wrappers from Patch 1/2 in
pthread_once.

Tested on x86 and x86_64.


2014-12-05  Torvald Riegel  <triegel@redhat.com>

	* nptl/pthread_once.c (clear_once_control): Use futex wrappers with
	error checking.
	(__pthread_once_slow): Likewise.
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