This function is a destructor, hence it should be named like one. (We usually use xyz_free() for a destructor that frees the object passed itself. xyz_unref() we typically use for destructors that are similar, but ref counted. xyz_done() usually is used for destructors which free the members of an object, but not the object itself – to allow stack allocation of objects. We don't strictly follow this, but it's good to stick to rules wherever we can.) No actual code change, just renaming.
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