[libata scsi] add ata_scsi_set_sense helper

  - add extern ata_scsi_set_sense() to build SCSI
    fixed sense data and corresponding SCSI status

Signed-off-by: Douglas Gilbert <dougg@torque.net>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
diff --git a/drivers/scsi/libata.h b/drivers/scsi/libata.h
index a4b55dc..4622e64 100644
--- a/drivers/scsi/libata.h
+++ b/drivers/scsi/libata.h
@@ -80,6 +80,8 @@
 extern void ata_scsi_badcmd(struct scsi_cmnd *cmd,
 			    void (*done)(struct scsi_cmnd *),
 			    u8 asc, u8 ascq);
+extern void ata_scsi_set_sense(struct scsi_cmnd *cmd,
+			       u8 sk, u8 asc, u8 ascq);
 extern void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
                         unsigned int (*actor) (struct ata_scsi_args *args,
                                            u8 *rbuf, unsigned int buflen));