libata passthru: always enforce correct DEV bit

 Always enforce correct DEV bit since we know which drive the command
is targeted. SAT demands to ignore the DEV bit, too.
Signed-off-by: Albert Lee <albertcc@tw.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/ata/libata-scsi.c

@@ -2595,11 +2595,9 @@ static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc)
 		tf->device = cdb[8];
 		tf->command = cdb[9];
 	}
-	/*
-	 * If slave is possible, enforce correct master/slave bit
-	*/
-	if (qc->ap->flags & ATA_FLAG_SLAVE_POSS)
-		tf->device = qc->dev->devno ?
+
+	/* enforce correct master/slave bit */
+	tf->device = dev->devno ?
 		tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1;
 
 	/* sanity check for pio multi commands */