[PATCH] firmware/arm_sdei: Fix invalid argument to unregister private events.

[Yun Levi]

> But, I think it should be checked on sdei_reboot_notifier.
> otherwise, In the situation sdei device was freezed, when
> sdei_reboot_notifier is called,
> It would fail on cpuhp_cb_check too.
>
> Should I add a sanity check on sdei_reboot_notifier in the next patch?
>

Sorry to make a noise. Maybe there's no case for this.