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

This patch fixes the following warnings:

drivers/isdn/i4l/isdn_tty.c: In function ‘isdn_tty_edit_at’:
drivers/isdn/i4l/isdn_tty.c:3644:18: warning: this statement may fall through 
[-Wimplicit-fallthrough=]
       m->mdmcmdl = 0;
       ~~~~~~~~~~~^~~
drivers/isdn/i4l/isdn_tty.c:3646:5: note: here
     case 0:
     ^~~~

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 <gust...@embeddedor.com>
---
 drivers/isdn/i4l/isdn_tty.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/isdn/i4l/isdn_tty.c b/drivers/isdn/i4l/isdn_tty.c
index dc1cded716c1..43700fc19a31 100644
--- a/drivers/isdn/i4l/isdn_tty.c
+++ b/drivers/isdn/i4l/isdn_tty.c
@@ -3642,7 +3642,7 @@ isdn_tty_edit_at(const char *p, int count, modem_info 
*info)
                                                break;
                                        } else
                                                m->mdmcmdl = 0;
-                                       /* Fall through, check for 'A' */
+                                       /* Fall through - check for 'A' */
                                case 0:
                                        if (c == 'A') {
                                                m->mdmcmd[m->mdmcmdl] = c;
-- 
2.20.1

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