[SCSI] libiscsi: don't bugon when if user sets markers

libiscsi does not support markers and if someone tries
to set them the driver does a BUG(). There is not need
to be that extreme. Just return -ENOSYS.
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

drivers/scsi/libiscsi.c

@@ -3163,7 +3163,6 @@ int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
 {
 	struct iscsi_conn *conn = cls_conn->dd_data;
 	struct iscsi_session *session = conn->session;
-	uint32_t value;
 
 	switch(param) {
 	case ISCSI_PARAM_FAST_ABORT:
@@ -3220,14 +3219,6 @@ int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
 	case ISCSI_PARAM_ERL:
 		sscanf(buf, "%d", &session->erl);
 		break;
-	case ISCSI_PARAM_IFMARKER_EN:
-		sscanf(buf, "%d", &value);
-		BUG_ON(value);
-		break;
-	case ISCSI_PARAM_OFMARKER_EN:
-		sscanf(buf, "%d", &value);
-		BUG_ON(value);
-		break;
 	case ISCSI_PARAM_EXP_STATSN:
 		sscanf(buf, "%u", &conn->exp_statsn);
 		break;