[libata] SCSI: simulator version, not device version, belongs in VPD

Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h
index 11f64a4..e45f6d5 100644
--- a/drivers/ata/libata.h
+++ b/drivers/ata/libata.h
@@ -29,6 +29,7 @@
 #define __LIBATA_H__
 
 #define DRV_NAME	"libata"
+#define DRV_VERSION	"2.21"	/* must be exactly four chars */
 
 struct ata_scsi_args {
 	struct ata_device	*dev;