Originally removed in:c1adab9703("drm/i915/guc: Remove failed doorbell stat from debugfs")f1448a62a1("drm/i915/guc: Remove last submission result from debugfs") Were accidentally restored in:925344ccc9("BackMerge tag 'v4.12-rc5' into drm-next") We can also remove unused variable and replace it with a WARN. Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Michal Wajdeczko <michal.wajdeczko@intel.com> Signed-off-by: Michał Winiarski <michal.winiarski@intel.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20170914083216.10192-1-michal.winiarski@intel.com Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>