[PATCH] arm64: cmpxchg: update macros to prevent warnings

[Mark Brown]

On Tue, Dec 03, 2013 at 07:15:27PM +0000, Mark Brown wrote:
> From: Mark Hambleton <mahamble at broadcom.com>
> 
> Make sure the value we are going to return is referenced in order to
> avoid warnings from newer GCCs such as:

Sorry, I was missing a commit --amend here - resent with the correction
made.
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