USB: serial: ir-usb: Silence harmless uninitialized variable warning

The "actual_length" variable might be uninitialized on some failure
paths.  It's harmless but static analysis tools like Smatch complain
and at runtime the UBSan tool will likely complain as well.

Fixes: e7542bc ("USB: serial: ir-usb: make set_termios synchronous")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Johan Hovold <johan@kernel.org>

drivers/usb/serial/ir-usb.c

@@ -448,7 +448,7 @@ static void ir_set_termios(struct tty_struct *tty,
 			usb_sndbulkpipe(udev, port->bulk_out_endpointAddress),
 			transfer_buffer, 1, &actual_length, 5000);
 	if (ret || actual_length != 1) {
-		if (actual_length != 1)
+		if (!ret)
 			ret = -EIO;
 		dev_err(&port->dev, "failed to change line speed: %d\n", ret);
 	}