Chris Wilson e46ff3f8c2 igt/gem_lut_handle: Fix errno checking
Regression from
commit c1404e05b7477122b9923ba029593c2cb64671a7
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Tue Apr 29 07:14:33 2014 +0100

    errno is reset after each syscall

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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