- Fix the last of the threading bugs that were introduced as far back as

   1.38 in 2001.  Break out of the FOREACH_THREAD_IN_PROC loop when we've
   discovered a new proc in the chain.
 - Increment i and check for maxlockdepth once per matching process not
   once per thread.  This didn't properly terminate the loop before.
 - Fix a bug which has existed potentially since rev 1.1.  waitblock->lf_next
   can be NULL when a thread has been woken-up but not yet scheduled.  Check
   for this condition rather than blindly dereferencing.

Found by:	libMicro

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