scsi: BusLogic: mark expected switch fall-through

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

Addresses-Coverity-ID: 1056537 ("Missing break in switch")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Acked-by: Khalid Aziz <khalid@gonehiking.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/BusLogic.c

@@ -2641,6 +2641,7 @@ static int blogic_resultcode(struct blogic_adapter *adapter,
 	case BLOGIC_BAD_CMD_PARAM:
 		blogic_warn("BusLogic Driver Protocol Error 0x%02X\n",
 				adapter, adapter_status);
+		/* fall through */
 	case BLOGIC_DATA_UNDERRUN:
 	case BLOGIC_DATA_OVERRUN:
 	case BLOGIC_NOEXPECT_BUSFREE: