staging: comedi: cb_pcidas: check for failure of subdev_8255_init

It's possible for subdev_8255_init() to fail due to its kzalloc().
Make sure to check for this failure and pass on the error code.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/cb_pcidas.c

@@ -1640,7 +1640,10 @@ static int cb_pcidas_attach(struct comedi_device *dev,
 
 	/* 8255 */
 	s = dev->subdevices + 2;
-	subdev_8255_init(dev, s, NULL, devpriv->pacer_counter_dio + DIO_8255);
+	ret = subdev_8255_init(dev, s, NULL,
+			       devpriv->pacer_counter_dio + DIO_8255);
+	if (ret)
+		return ret;
 
 	/*  serial EEPROM, */
 	s = dev->subdevices + 3;