staging: comedi: daqboard2000: void *plx should be a void __iomem *

The private data variable 'plx' is an ioremap'ed pci resource and
should be a void __iomem *. This quiets a number of sparse warnings
about "different address spaces".
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/daqboard2000.c

@@ -318,7 +318,7 @@ struct daqboard2000_private {
 		card_daqboard_2000
 	} card;
 	void *daq;
-	void *plx;
+	void __iomem *plx;
 	unsigned int ao_readback[2];
 };