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qio: fix memory leak in qproduce()

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

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

@@ -646,6 +646,7 @@

 	if(q->len >= q->limit){

 		q->state |= Qflow;

 		iunlock(q);

+		freeb(b);

 		return -1;

 	}

 	producecnt += len;