[WATCHDOG] constify function pointer tables

"static struct file_operations" should be
"static const struct file_operations".

Signed-off-by: Jan Engelhardt <jengelh@computergmbh.de>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

diff --git a/drivers/watchdog/mpc5200_wdt.c b/drivers/watchdog/mpc5200_wdt.c
index 11f6a11..80a91d4 100644
--- a/drivers/watchdog/mpc5200_wdt.c
+++ b/drivers/watchdog/mpc5200_wdt.c
@@ -158,7 +158,7 @@
 	return 0;
 }
 
-static struct file_operations mpc5200_wdt_fops = {
+static const struct file_operations mpc5200_wdt_fops = {
 	.owner	= THIS_MODULE,
 	.write	= mpc5200_wdt_write,
 	.ioctl	= mpc5200_wdt_ioctl,