Fix Asan warning (not a real problem)

jsrc/ct.c

@@ -609,8 +609,9 @@ C jtjobrun(J jt,unsigned char(*f)(J,void*,UI4),void *ctx,UI4 n,I poolno){JOBQ *j
   job->next=0; jobq->ht[1]->next=job; jobq->ht[1]=job;  // clear chain in job; point the last job to it, and the tail ptr.  If queue is empty these both store to tailptr
   oldjob=(oldjob==0)?job:oldjob;   //  Keep old head unless it was empty
   ++jobq->futex;  // while under lock, advance futex value to indicate that we have added a job
+  I nwaiters=jobq->waiters;  // see if there are waiting threads
   JOBUNLOCK(jobq,oldjob);  // set head pointer, which unlocks.
-  if(jobq->waiters!=0)jfutex_wakea(&jobq->futex);  // if there are waiting threads, wake them up.  We test in case there are no worker threads
+  if(nwaiters!=0)jfutex_wakea(&jobq->futex);  // if there are waiting threads, wake them up.  We test in case there are no worker threads.  Not really necessary to read under lock, but it silences asan
   lastqueuedtask=n-1;  // if we take this task here, it is special
    // todo scaf: would be nice to wake only as many as we have work for
  }

jsrc/dsusp.c

@@ -20,7 +20,7 @@ void moveparseinfotosi(J jt){movesentencetosi(jt,jt->parserstackframe.parserstkb
 /*    ASSERT(blah,EVDOMAIN);                             */
 /*    debz()                                             */
 // t is the type of stack entry.  The entry is allocated and filled in
-// the type DCPM is for powt-mortem debugging.  It is like DCCALL but chained on jt->pmstacktop rather than jt->sitop, and chained
+// the type DCPM is for post-mortem debugging.  It is like DCCALL but chained on jt->pmstacktop rather than jt->sitop, and chained
 // in bottom-to-top order that must be reversed when transferred to the debug stack
 // meanings of the args:
 // DCPARSE: x=&tokens  y=#tokens

jsrc/m.c

@@ -836,6 +836,9 @@ A jtrealize(J jt, A w){A z; I t;
 //
 // result is the address of the block, which may have changed if it had to be realized.  result can be 0
 // if the block could not be realized
+//
+// On return tnextpushp will be old or old+1, UNLESS (1) w is 0 - no guarantees then; (2) w is VIRTUALBOXED, where we know
+// the value is going to be opened & we don't want to free any backers
 
 A jtgc(J jt,A w,A* old){
  ARGCHK1(w);  // return if no input (could be error or unfilled box)