i915: Clean up sarea pointers on leavevt
This corresponds to the setup of the sarea pointers in DMA initialization, though neither is exactly the point at which the sarea is set up or torn down. Signed-off-by: NKeith Packard <keithp@keithp.com> Signed-off-by: NEric Anholt <eric@anholt.net> Signed-off-by: NDave Airlie <airlied@linux.ie>
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