[SCSI] remove REQ_SPECIAL in scsi_init_io()

scsi_init_io() used to set REQ_SPECIAL when it fails sg
allocation before requeueing the request by returning
BLKPREP_DEFER.  REQ_SPECIAL is being updated to mean special
requests.  So, remove REQ_SPECIAL setting.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/scsi_lib.c

@@ -941,10 +941,8 @@ static int scsi_init_io(struct scsi_cmnd *cmd)
 	 * if sg table allocation fails, requeue request later.
 	 */
 	sgpnt = scsi_alloc_sgtable(cmd, GFP_ATOMIC);
-	if (unlikely(!sgpnt)) {
-		req->flags |= REQ_SPECIAL;
+	if (unlikely(!sgpnt))
 		return BLKPREP_DEFER;
-	}
 
 	cmd->request_buffer = (char *) sgpnt;
 	cmd->request_bufflen = req->nr_sectors << 9;