[PATCH] scsi: wd33c93: Mark expected swich fall-through

["Gustavo A. R. Silva" <gustavo@xxxxxxxxxxxxxx>]

Mark switch cases where we are expecting to fall through.

This patch fixes the following warning (Building: m68k):

drivers/scsi/wd33c93.c: In function ‘round_4’:
drivers/scsi/wd33c93.c:1856:11: warning: this statement may fall through [-Wimplicit-fallthrough=]
   case 2: ++x;
           ^~~
drivers/scsi/wd33c93.c:1857:3: note: here
   case 3: ++x;
   ^~~~

Signed-off-by: Gustavo A. R. Silva <gustavo@xxxxxxxxxxxxxx>
---
 drivers/scsi/wd33c93.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/scsi/wd33c93.c b/drivers/scsi/wd33c93.c
index fb7b289fa09f..f81046f0e68a 100644
--- a/drivers/scsi/wd33c93.c
+++ b/drivers/scsi/wd33c93.c
@@ -1854,6 +1854,7 @@ round_4(unsigned int x)
 		case 1: --x;
 			break;
 		case 2: ++x;
+			/* fall through */
 		case 3: ++x;
 	}
 	return x;
-- 
2.22.0