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Since commit 64d6c500

 ("drm/i915: Generalise GPU activity
tracking"), we have been prepared for i915_vma_move_to_active() to fail.
We can take advantage of this to report the failure for allocating the
shared-fence slot in the reservation_object.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190730205805.3733-1-chris@chris-wilson.co.uk