[SCSI] libsas: Unknown STP devices should be reported to libata as unknown.

When libsas encounters a STP device whose protocol isn't recognized (i.e.
not ATA or ATAPI), we should set the ata_device's class to ATA_DEV_UNKNOWN
instead of ATA_DEV_ATA.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/libsas/sas_ata.c

@@ -232,7 +232,7 @@ static void sas_ata_phy_reset(struct ata_port *ap)
 			SAS_DPRINTK("%s: Unknown SATA command set: %d.\n",
 				    __FUNCTION__,
 				    dev->sata_dev.command_set);
-			ap->device[0].class = ATA_DEV_ATA;
+			ap->device[0].class = ATA_DEV_UNKNOWN;
 			break;
 	}