- Revert the part of r247601 which turned the overtemperature and power fail   interrupt shutdown handlers into filters. Shutdown_nice(9) acquires a sleep   lock, which filters shouldn't do. It also seems that kern_reboot(9) still   may require Giant to be hold. - Correct an incorrect argument to shutdown_nice(9).
- Revert the part of r247601 which turned the overtemperature and power fail
  interrupt shutdown handlers into filters. Shutdown_nice(9) acquires a sleep
  lock, which filters shouldn't do. It also seems that kern_reboot(9) still
  may require Giant to be hold.
- Correct an incorrect argument to shutdown_nice(9).

Submitted by:	bde

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