In preparation to enabling -Wimplicit-fallthrough, mark switch
cases where we are expecting to fall through.
This patch fixes the following warning:

In file included from drivers/scsi/dmx3191d.c:48:
drivers/scsi/NCR5380.c: In function ‘NCR5380_information_transfer’:
drivers/scsi/NCR5380.c:1933:9: warning: this statement may fall through 
[-Wimplicit-fallthrough=]
      if (!hostdata->connected)
         ^
drivers/scsi/NCR5380.c:1937:5: note: here
     default:
     ^~~~~~~

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>
---
Changes in v2:
 - Update commit log.
 - Move code comment after the default label and
   retain reason for fall-through in comment as
   requested by Michael Schmitz.

 drivers/scsi/NCR5380.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/scsi/NCR5380.c b/drivers/scsi/NCR5380.c
index 01c23d27f290..985d1c053578 100644
--- a/drivers/scsi/NCR5380.c
+++ b/drivers/scsi/NCR5380.c
@@ -1933,13 +1933,12 @@ static void NCR5380_information_transfer(struct 
Scsi_Host *instance)
                                        if (!hostdata->connected)
                                                return;
 
-                                       /* Fall through to reject message */
-
+                                       /* Fall through - to reject message */
+                               default:
                                        /*
-                                        * If we get something weird that we 
aren't expecting,
-                                        * reject it.
+                                        * If we get something weird that we
+                                        * aren't expecting, reject it.
                                         */
-                               default:
                                        if (tmp == EXTENDED_MESSAGE)
                                                scmd_printk(KERN_INFO, cmd,
                                                            "rejecting unknown 
extended message code %02x, length %d\n",
-- 
2.21.0

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