Adjust assertions to allow for magical properties of the 'lbolt' wait channel for tsleep(): - Allow tsleep() on &lbolt without Giant with a timeout 0 since &lbolt has   an implied timeout. - If &lbolt is used with msleep() pass NULL to sleepq_add() for the lock   object.  Unlike other sleepq channels, &lbolt doesn't have an associated   owning lock.
Adjust assertions to allow for magical properties of the 'lbolt' wait
channel for tsleep():
- Allow tsleep() on &lbolt without Giant with a timeout 0 since &lbolt has
  an implied timeout.
- If &lbolt is used with msleep() pass NULL to sleepq_add() for the lock
  object.  Unlike other sleepq channels, &lbolt doesn't have an associated
  owning lock.

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