The per-CPU spinlocks list is only maintained when WITNESS is enabled. Thus, treat all page faults while in a critical section as fatal rather than just those that occur with a non-empty spinlocks list.  All such page faults are fatal anyways.  Calling trap_fatal() earlier increases the chances of getting more useful panic messages and a possible DDB prompt.
The per-CPU spinlocks list is only maintained when WITNESS is enabled.
Thus, treat all page faults while in a critical section as fatal rather
than just those that occur with a non-empty spinlocks list.  All such page
faults are fatal anyways.  Calling trap_fatal() earlier increases the
chances of getting more useful panic messages and a possible DDB prompt.

Approved by:	re (scottl)

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