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Because the helper function which calls this callback checks whether it is registered or not. It is not necessary if it does nothing. So it would be better to remove the function for clarity. Signed-off-by: Hyungwon Hwang <human.hwang@samsung.com> Reviewed-by: Andrzej Hajda <a.hajda@samsung.com> Signed-off-by: Inki Dae <inki.dae@samsung.com>