staging: comedi: me4000: combine the checks for valid io addresses

Combine the sanity checks for valid io addresses into one if().

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/me4000.c

@@ -1776,15 +1776,9 @@ static int me4000_attach_pci(struct comedi_device *dev,
 		return result;
 
 	info->plx_regbase = pci_resource_start(pcidev, 1);
-	if (!info->plx_regbase)
-		return -ENODEV;
-
 	dev->iobase = pci_resource_start(pcidev, 2);
-	if (!dev->iobase)
-		return -ENODEV;
-
 	info->timer_regbase = pci_resource_start(pcidev, 3);
-	if (!info->timer_regbase)
+	if (!info->plx_regbase || !dev->iobase || !info->timer_regbase)
 		return -ENODEV;
 
 	dev->irq = pcidev->irq;