Replace the existing /* fall through */ comments and its variants with
the new pseudo-keyword macro fallthrough[1].

[1] 
https://www.kernel.org/doc/html/v5.7-rc7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through

Signed-off-by: Gustavo A. R. Silva <[email protected]>
---
 drivers/watchdog/scx200_wdt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/watchdog/scx200_wdt.c b/drivers/watchdog/scx200_wdt.c
index c94098acb78f..7b5e18323f3f 100644
--- a/drivers/watchdog/scx200_wdt.c
+++ b/drivers/watchdog/scx200_wdt.c
@@ -186,7 +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 */
+               fallthrough;
        case WDIOC_GETTIMEOUT:
                if (put_user(margin, p))
                        return -EFAULT;
-- 
2.27.0

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