drm/i915/ringbuffer: Fix sign of ring space.
authorChris Wilson <chris@chris-wilson.co.uk>
Thu, 23 Sep 2010 16:45:39 +0000 (17:45 +0100)
committerChris Wilson <chris@chris-wilson.co.uk>
Fri, 24 Sep 2010 13:19:55 +0000 (14:19 +0100)
As we presume space is signed when computing and looking for wrap along,
make it so.

Reported-by: Owain G. Ainsworth <zerooa@googlemail.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

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