Mark switch cases where we are expecting to fall through.

This patch fixes the following warnings (Building: sparc64):

drivers/watchdog/riowd.c: In function ‘riowd_ioctl’:
drivers/watchdog/riowd.c:136:3: warning: this statement may fall through 
[-Wimplicit-fallthrough=]
   riowd_writereg(p, riowd_timeout, WDTO_INDEX);
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/watchdog/riowd.c:139:2: note: here
  case WDIOC_GETTIMEOUT:
  ^~~~

Signed-off-by: Gustavo A. R. Silva <[email protected]>
---
 drivers/watchdog/riowd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/watchdog/riowd.c b/drivers/watchdog/riowd.c
index 41a2a11535a6..b35f7be20c00 100644
--- a/drivers/watchdog/riowd.c
+++ b/drivers/watchdog/riowd.c
@@ -134,7 +134,7 @@ static long riowd_ioctl(struct file *filp, unsigned int 
cmd, unsigned long arg)
                        return -EINVAL;
                riowd_timeout = (new_margin + 59) / 60;
                riowd_writereg(p, riowd_timeout, WDTO_INDEX);
-               /* Fall */
+               /* Fall through */
 
        case WDIOC_GETTIMEOUT:
                return put_user(riowd_timeout * 60, (int __user *)argp);
-- 
2.22.0

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