- Introduce a new function bremfreel() that does a bremfree with the buf

   queue lock already held.
 - In getblk() and flushbufqueues() use bremfreel() while we still have the
   buf queue lock held to keep the lists consistent.
 - Add LK_NOWAIT to two cases where we're essentially asserting that the bufs
   are not locked while acquiring the locks.  This will make sure that we get
   the appropriate panic() and not another one for sleeping with a lock held.

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