drm_mm: extract check_free_mm_node
There are already two copies of this logic. And the new scanning stuff will add some more. So extract it into a small helper function. Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch> Acked-by: NThomas Hellstrom <thellstrom@vmwgfx.com> Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Signed-off-by: NDave Airlie <airlied@redhat.com>
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