watchdog: sc1200: constify pnp_device_id

pnp_device_id are not supposed to change at runtime. All functions
working with pnp_device_id provided by <linux/pnp.h> work with
const pnp_device_id. So mark the non-const structs as const.

Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
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/sc1200wdt.c

@@ -342,7 +342,7 @@ static int __init sc1200wdt_probe(void)
 
 #if defined CONFIG_PNP
 
-static struct pnp_device_id scl200wdt_pnp_devices[] = {
+static const struct pnp_device_id scl200wdt_pnp_devices[] = {
 	/* National Semiconductor PC87307/PC97307 watchdog component */
 	{.id = "NSC0800", .driver_data = 0},
 	{.id = ""},