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nusb/serial: set exit status

--- a/sys/src/cmd/nusb/serial/serial.c

+++ b/sys/src/cmd/nusb/serial/serial.c

@@ -879,8 +879,11 @@

 	}

 	qunlock(ser);

-	if(nports > 0){

-		snprint(buf, sizeof buf, "%d.serial", dev->id);

-		threadpostsharesrv(&serialfs, nil, "usb", buf);

-	}

+

+	if(nports == 0)

+		threadexits("no ports");

+

+	snprint(buf, sizeof buf, "%d.serial", dev->id);

+	threadpostsharesrv(&serialfs, nil, "usb", buf);

+	threadexits(0);

 }

-- 

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