s390/3215: add switch fall through comment for -Wimplicit-fallthrough

Silence the following warning when built with -Wimplicit-fallthrough=3
enabled by default since 5.3-rc2:
drivers/s390/char/con3215.c: In function 'raw3215_irq':
drivers/s390/char/con3215.c:399:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
  399 |   if (dstat == 0x08)
      |      ^
drivers/s390/char/con3215.c:401:2: note: here
  401 |  case 0x04:
      |  ^~~~

Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

diff --git a/drivers/s390/char/con3215.c b/drivers/s390/char/con3215.c
index 8c9d412..e7cf0a1 100644 (file)
--- a/drivers/s390/char/con3215.c
+++ b/drivers/s390/char/con3215.c
@@ -398,6 +398,7 @@ static void raw3215_irq(struct ccw_device *cdev, unsigned long intparm,
                }
                if (dstat == 0x08)
                        break;
+               /* else, fall through */
        case 0x04:
                /* Device end interrupt. */
                if ((raw = req->info) == NULL)