staging: comedi: addi_apci_1516: remove devpriv->dw_AiBase

This driver does not ioremap the PCI bar stored in devpriv->dw_AiBase.
Remove the iounmap.
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/addi_apci_1516.c

@@ -180,14 +180,9 @@ static int __devinit apci1516_auto_attach(struct comedi_device *dev,
 static void apci1516_detach(struct comedi_device *dev)
 {
 	struct pci_dev *pcidev = comedi_to_pci_dev(dev);
-	struct addi_private *devpriv = dev->private;
 
-	if (devpriv) {
-		if (dev->iobase)
-			apci1516_reset(dev);
-		if (devpriv->dw_AiBase)
-			iounmap(devpriv->dw_AiBase);
-	}
+	if (dev->iobase)
+		apci1516_reset(dev);
 	if (pcidev) {
 		if (dev->iobase)
 			comedi_pci_disable(pcidev);