watchdog: iTCO_wdt: constify iTCO_wdt_pm structure

iTCO_wdt_pm, of type struct dev_pm_ops, is never modified, so declare it as
const.

Done with the help of Coccinelle.
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

drivers/watchdog/iTCO_wdt.c

@@ -629,7 +629,7 @@ static int iTCO_wdt_resume_noirq(struct device *dev)
 	return 0;
 }
 
-static struct dev_pm_ops iTCO_wdt_pm = {
+static const struct dev_pm_ops iTCO_wdt_pm = {
 	.suspend_noirq = iTCO_wdt_suspend_noirq,
 	.resume_noirq = iTCO_wdt_resume_noirq,
 };