watchdog: omap_wdt.c: fix the WDIOC_GETBOOTSTATUS ioctl if not implemented.

WDIOC_GETBOOTSTATUS ioctl is imlemented for cpu_is_omap16xx and cpu_is_omap24xx
cpus only. For other cpus it falls through to WDIOC_KEEPALIVE.
This patch prevents the fall through.

Cc: sricharan <r.sricharan@ti.com>
Signed-off-by: Shubhrajyoti D <shubhrajyoti@ti.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

drivers/watchdog/omap_wdt.c

@@ -232,6 +232,7 @@ static long omap_wdt_ioctl(struct file *file, unsigned int cmd,
 		if (cpu_is_omap24xx())
 			return put_user(omap_prcm_get_reset_sources(),
 					(int __user *)arg);
+		return put_user(0, (int __user *)arg);
 	case WDIOC_KEEPALIVE:
 		pm_runtime_get_sync(wdev->dev);
 		spin_lock(&wdt_lock);