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Remove sysfs attributes before removing a target instead of testing the target state in every sysfs attribute callback method. Note: it is safe to invoke a sysfs attribute removal method like device_remove_file() twice on the same attribute. Signed-off-by: Bart Van Assche <bvanassche@acm.org> Acked-by: David Dillow <dillowda@ornl.gov> Signed-off-by: Roland Dreier <roland@purestorage.com>