drm/i915: Unconditionally get the fence reg when pinning scanout

We use i915_gem_object_get_fence_reg() to do LRU tracking of the fence
registers, so stop trying to be too clever when pinning the fb->obj.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
1 file changed