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kernel: make sure process is in Queueing state in qunlock()

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

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

@@ -134,6 +134,8 @@

 			getcallerpc(&q));

 	p = q->head;

 	if(p != nil){

+		if(p->state != Queueing)

+			panic("qunlock");

 		q->pc = p->qpc;

 		q->head = p->qnext;

 		if(q->head == nil)