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: e7542bc382f8 ("USB: serial: ir-usb: make set_termios synchronous")
Signed-off-by: Dan Carpenter <[e-mail]>
Signed-off-by: Johan Hovold <[e-mail]>

drivers/usb/serial/ir-usb.c

···
 			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);
 	}