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Check that we own the global pointer before deregistering. Reported-by: Venkata Sandeep Dhanalakota <venkata.s.dhanalakota@intel.com> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Venkata Sandeep Dhanalakota <venkata.s.dhanalakota@intel.com> Cc: Andi Shyti <andi.shyti@intel.com> Reviewed-by: Venkata Sandeep Dhanalakota <venkata.s.dhanalakota@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20191210153620.3929372-1-chris@chris-wilson.co.uk