drm/i915: Optimize DIV_ROUND_CLOSEST call
DIV_ROUND_CLOSEST is faster if the compiler knows it will only be dealing with unsigned dividends. This optimization rips 32 bytes of binary code on x86_64. Signed-off-by: NJean Delvare <khali@linux-fr.org> Cc: Guenter Roeck <linux@roeck-us.net> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: David Airlie <airlied@linux.ie> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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