[PATCH] watchdog: w83877f_wdt: Mark expected switch fall-through

[Gustavo A. R. Silva]

In preparation to enabling -Wimplicit-fallthrough, mark switch
cases where we are expecting to fall through.

This patch fixes the following warning:

drivers/watchdog/w83877f_wdt.c: In function âfop_ioctlâ:
drivers/watchdog/w83877f_wdt.c:294:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
   wdt_keepalive();
   ^~~~~~~~~~~~~~~
drivers/watchdog/w83877f_wdt.c:297:2: note: here
  case WDIOC_GETTIMEOUT:
  ^~~~

Warning level 3 was used: -Wimplicit-fallthrough=3

Notice that, in this particular case, the code comment is modified
in accordance with what GCC is expecting to find.

This patch is part of the ongoing efforts to enable
-Wimplicit-fallthrough.

Signed-off-by: Gustavo A. R. Silva <gustavo@xxxxxxxxxxxxxx>
---
 drivers/watchdog/w83877f_wdt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/watchdog/w83877f_wdt.c b/drivers/watchdog/w83877f_wdt.c
index 05658ecc0aa4..db9b6488e388 100644
--- a/drivers/watchdog/w83877f_wdt.c
+++ b/drivers/watchdog/w83877f_wdt.c
@@ -292,8 +292,8 @@ static long fop_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 
 		timeout = new_timeout;
 		wdt_keepalive();
-		/* Fall through */
 	}
+		/* Fall through */
 	case WDIOC_GETTIMEOUT:
 		return put_user(timeout, p);
 	default:
-- 
2.21.0