tty: Fix leak in ti-usb

If the ti-usb adapter returns an zero data length frame (which happens)
then we leak a kref.  Found by Christoph Mair <christoph.mair@gmail.com>
who proposed a patch.  The patch here is different as Christoph's patch
didn't work for the case where tty = NULL and data arrived but Christoph
did all the hard work chasing it down.
Signed-off-by: NAlan Cox <alan@linux.intel.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/usb/serial/ti_usb_3410_5052.c

@@ -1215,20 +1215,22 @@ static void ti_bulk_in_callback(struct urb *urb)
 	}
 
 	tty = tty_port_tty_get(&port->port);
-	if (tty && urb->actual_length) {
+	if (tty) {
+		if (urb->actual_length) {
 			usb_serial_debug_data(debug, dev, __func__,
 				urb->actual_length, urb->transfer_buffer);
 
 			if (!tport->tp_is_open)
-			dbg("%s - port closed, dropping data", __func__);
+				dbg("%s - port closed, dropping data",
+					__func__);
 			else
 				ti_recv(&urb->dev->dev, tty,
 						urb->transfer_buffer,
 						urb->actual_length);
-
 			spin_lock(&tport->tp_lock);
 			tport->tp_icount.rx += urb->actual_length;
 			spin_unlock(&tport->tp_lock);
+		}
 		tty_kref_put(tty);
 	}