staging: comedi: pcmmio: tidy up switch_page()

All the I/O ports are left unlocked in the driver so the 'pagelock'
in the private data is not necessary. The paranoia sanity checks
are also unnecessary, Remove them.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/pcmmio.c

@@ -213,7 +213,6 @@ struct pcmmio_subdev_private {
 struct pcmmio_private {
 	/* stuff for DIO */
 	struct {
-		unsigned char pagelock;	/* current page and lock */
 		/* shadow of POLx registers */
 		unsigned char pol[NUM_PAGED_REGS];
 		/* shadow of ENABx registers */
@@ -318,16 +317,7 @@ static void switch_page(struct comedi_device *dev, int asic, int page)
 {
 	struct pcmmio_private *devpriv = dev->private;
 
-	if (asic < 0 || asic >= 1)
-		return;		/* paranoia */
-	if (page < 0 || page >= NUM_PAGES)
-		return;		/* more paranoia */
-
-	devpriv->asics[asic].pagelock &= ~REG_PAGE_MASK;
-	devpriv->asics[asic].pagelock |= page << REG_PAGE_BITOFFSET;
-
-	/* now write out the shadow register */
-	outb(devpriv->asics[asic].pagelock,
+	outb(page << REG_PAGE_BITOFFSET,
 	     devpriv->asics[asic].iobase + REG_PAGELOCK);
 }