[WATCHDOG] watchdog_info constify

make the watchdog_info struct const where possible.

Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

diff --git a/drivers/watchdog/acquirewdt.c b/drivers/watchdog/acquirewdt.c
index 4d18c87..2ffce4d 100644
--- a/drivers/watchdog/acquirewdt.c
+++ b/drivers/watchdog/acquirewdt.c
@@ -150,7 +150,7 @@
 	int options, retval = -EINVAL;
 	void __user *argp = (void __user *)arg;
 	int __user *p = argp;
-	static struct watchdog_info ident = {
+	static const struct watchdog_info ident = {
 		.options = WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
 		.firmware_version = 1,
 		.identity = WATCHDOG_NAME,