[netdrvr] via-rhine: Use register offset definition for WOLcgClr

Use register offset definition for WOLcgClr, rather than a magic
number.

This patch does not change the driver behaviour.
Signed-off-by: Laura Garcia Liebana <nevola@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/net/via-rhine.c

@@ -1893,7 +1893,7 @@ static void rhine_shutdown (struct pci_dev *pdev)
 
 	/* Make sure we use pattern 0, 1 and not 4, 5 */
 	if (rp->quirks & rq6patterns)
-		iowrite8(0x04, ioaddr + 0xA7);
+		iowrite8(0x04, ioaddr + WOLcgClr);
 
 	if (rp->wolopts & WAKE_MAGIC) {
 		iowrite8(WOLmagic, ioaddr + WOLcrSet);