Mark switch cases where we are expecting to fall through.

This patch fixes the following warning (Building: i386):

drivers/watchdog/scx200_wdt.c: In function ‘scx200_wdt_ioctl’:
drivers/watchdog/scx200_wdt.c:188:3: warning: this statement may fall through 
[-Wimplicit-fallthrough=]
   scx200_wdt_ping();
   ^~~~~~~~~~~~~~~~~
drivers/watchdog/scx200_wdt.c:189:2: note: here
  case WDIOC_GETTIMEOUT:
  ^~~~

Signed-off-by: Gustavo A. R. Silva <[email protected]>
---
 drivers/watchdog/scx200_wdt.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/watchdog/scx200_wdt.c b/drivers/watchdog/scx200_wdt.c
index efd7996694de..46268309ee9b 100644
--- a/drivers/watchdog/scx200_wdt.c
+++ b/drivers/watchdog/scx200_wdt.c
@@ -186,6 +186,7 @@ static long scx200_wdt_ioctl(struct file *file, unsigned 
int cmd,
                margin = new_margin;
                scx200_wdt_update_margin();
                scx200_wdt_ping();
+               /* Fall through */
        case WDIOC_GETTIMEOUT:
                if (put_user(margin, p))
                        return -EFAULT;
-- 
2.22.0

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