drm/i915: Drop mutex after successful kref_put_mutex()
The kref_put_mutex() returns with the mutex held after freeing the object - so we must remember to drop it... Fixes: 69df05e1 ("drm/i915: Simplify releasing context reference") Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20161219101357.28140-1-chris@chris-wilson.co.ukReviewed-by: NJoonas Lahtinen <joonas.lahtinen@linux.intel.com>
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