drm/i915: export size_is_valid() from __intel_fbc_update()
Make the giant function a little less giant. Signed-off-by: NPaulo Zanoni <paulo.r.zanoni@intel.com> Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk> [danvet: Add pipe_ prefix as suggested by Chris.] Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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