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

This patch fixes the following warning:

drivers/message/fusion/mptbase.c: In function ‘mptbase_reply’:
drivers/message/fusion/mptbase.c:643:6: warning: this statement may fall 
through [-Wimplicit-fallthrough=]
   if (event != MPI_EVENT_EVENT_CHANGE)
      ^
drivers/message/fusion/mptbase.c:646:2: note: here
  case MPI_FUNCTION_CONFIG:
  ^~~~

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/message/fusion/mptbase.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/message/fusion/mptbase.c b/drivers/message/fusion/mptbase.c
index ba551d8dfba4..d8882b0a1338 100644
--- a/drivers/message/fusion/mptbase.c
+++ b/drivers/message/fusion/mptbase.c
@@ -642,7 +642,7 @@ mptbase_reply(MPT_ADAPTER *ioc, MPT_FRAME_HDR *req, 
MPT_FRAME_HDR *reply)
                        freereq = 0;
                if (event != MPI_EVENT_EVENT_CHANGE)
                        break;
-               /* else: fall through */
+               /* fall through */
        case MPI_FUNCTION_CONFIG:
        case MPI_FUNCTION_SAS_IO_UNIT_CONTROL:
                ioc->mptbase_cmds.status |= MPT_MGMT_STATUS_COMMAND_GOOD;
-- 
2.20.1

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