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fix missed clunkq wakeup race

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

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

@@ -500,17 +500,16 @@

 				poperror();

 			}

 		}

+		qunlock(&clunkq.q);

 		lock(&clunkq.l);

 		c = clunkq.head;

 		if(c == nil){

 			unlock(&clunkq.l);

-			qunlock(&clunkq.q);

 			pexit("no work", 1);

 		}

 		clunkq.head = c->next;

 		clunkq.nclosed++;

 		unlock(&clunkq.l);

-		qunlock(&clunkq.q);

 		if(!waserror()){

 			devtab[c->type]->close(c);

 			poperror();

-- 

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