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libc/qlock: don't allow unlocking unlocked lock

replace print with abort

--- a/sys/src/libc/9sys/qlock.c

+++ b/sys/src/libc/9sys/qlock.c

@@ -82,8 +82,7 @@

 	lock(&q->lock);

 	if (q->locked == 0)

-		fprint(2, "qunlock called with qlock not held, from %#p\n",

-			getcallerpc(&q));

+		abort();

 	p = q->head;

 	if(p != nil){

 		/* wakeup head waiting process */

-- 

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