scsi_dh: return SCSI_DH_NOTCONN in scsi_dh_activate()

When calling scsi_dh_activate() we should be returning
SCSI_DH_NOTCONN if the device handler couldn't be attached.
Reviewed-by: NBart van Assche <bart.vanassche@sandisk.com>
Reviewed-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NJames Bottomley <JBottomley@Odin.com>

drivers/scsi/scsi_dh.c

@@ -326,6 +326,7 @@ int scsi_dh_activate(struct request_queue *q, activate_complete fn, void *data)
 
 	if (!sdev->handler)
 		goto out_fn;
+	err = SCSI_DH_NOTCONN;
 	if (sdev->sdev_state == SDEV_CANCEL ||
 	    sdev->sdev_state == SDEV_DEL)
 		goto out_fn;