watchdog: ie6xx_wdt.c: fix printk format warning

Fix printk format warning; use cast to u64 since resource_size_t can
be either u32 or u64.

drivers/watchdog/ie6xx_wdt.c:261:4: warning: format '%x' expects type 'unsigned int', but argument 3 has type 'resource_size_t'
Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

drivers/watchdog/ie6xx_wdt.c

@@ -257,8 +257,8 @@ static int __devinit ie6xx_wdt_probe(struct platform_device *pdev)
 		return -ENODEV;
 
 	if (!request_region(res->start, resource_size(res), pdev->name)) {
-		dev_err(&pdev->dev, "Watchdog region 0x%x already in use!\n",
-			res->start);
+		dev_err(&pdev->dev, "Watchdog region 0x%llx already in use!\n",
+			(u64)res->start);
 		return -EBUSY;
 	}