staging: comedi: das16m1: use comedi_request_region()

Use comedi_request_region() to request the I/O region used by this
driver. Remove the error message when the request_region() fails,
comedi_request_reqion() will output the error message if necessary.

This driver does a second request_region() for the I/O space needed
by the 8255 chip. Modify the error message if that request fails so
it matches to format of the comedi_request_region() message.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/das16m1.c

@@ -571,26 +571,24 @@ static int das16m1_attach(struct comedi_device *dev,
 	struct comedi_subdevice *s;
 	int ret;
 	unsigned int irq;
-	unsigned long iobase;
-
-	iobase = it->options[0];
 
 	devpriv = kzalloc(sizeof(*devpriv), GFP_KERNEL);
 	if (!devpriv)
 		return -ENOMEM;
 	dev->private = devpriv;
 
-	if (!request_region(iobase, DAS16M1_SIZE, dev->board_name)) {
-		comedi_error(dev, "I/O port conflict\n");
-		return -EIO;
-	}
-	if (!request_region(iobase + DAS16M1_82C55, DAS16M1_SIZE2,
+	ret = comedi_request_region(dev, it->options[0], DAS16M1_SIZE);
+	if (ret)
+		return ret;
+	/* Request an additional region for the 8255 */
+	if (!request_region(dev->iobase + DAS16M1_82C55, DAS16M1_SIZE2,
 			    dev->board_name)) {
-		release_region(iobase, DAS16M1_SIZE);
-		comedi_error(dev, "I/O port conflict\n");
+		release_region(dev->iobase, DAS16M1_SIZE);
+		dev_warn(dev->class_dev, "%s: I/O port conflict (%#lx,%d)\n",
+			 dev->board_name,
+			 dev->iobase + DAS16M1_82C55, DAS16M1_SIZE2);
 		return -EIO;
 	}
-	dev->iobase = iobase;
 
 	/* now for the irq */
 	irq = it->options[1];