ide: hpt366: mark expected switch fall-throughs

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

This patch fixes the following warning:

drivers/ide/hpt366.c: In function ‘hpt3xx_udma_filter’:
drivers/ide/hpt366.c:574:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
if (!HPT370_ALLOW_ATA100_5 ||

      ^

drivers/ide/hpt366.c:578:2: note: here
case HPT372 :
^~~~
drivers/ide/hpt366.c: In function ‘hpt3xx_mdma_filter’:
drivers/ide/hpt366.c:602:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
if (ata_id_is_sata(drive->id))

      ^

drivers/ide/hpt366.c:605:2: 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.

---
 drivers/ide/hpt366.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

index 4d565b0c5a6e..0a3f9bcc8b04 100644
@@ -574,7 +574,7 @@ static u8 hpt3xx_udma_filter(ide_drive_t *drive)
 		if (!HPT370_ALLOW_ATA100_5 ||
 		    check_in_drive_list(drive, bad_ata100_5))
 			return ATA_UDMA4;
-		/* else: fall through */
+		/* fall through */
 	case HPT372 :
 	case HPT372A:
 	case HPT372N:

@@ -601,7 +601,7 @@ static u8 hpt3xx_mdma_filter(ide_drive_t *drive)
 	case HPT374 :
 		if (ata_id_is_sata(drive->id))
 			return 0x00;
-		/* else: fall through */
+		/* fall through */
 	default:
 		return 0x07;
 	}

2.20.1