Revert "update: check return of create dsci if failed because of exis…

…ting (#1…" (#1122)

This reverts commit d2f656a.

pkg/upgrade/upgrade.go

@@ -167,7 +167,7 @@ func CreateDefaultDSCI(ctx context.Context, cli client.Client, _ cluster.Platfor
 	case len(instances.Items) == 0:
 		fmt.Println("create default DSCI CR.")
 		err := cluster.CreateWithRetry(ctx, cli, defaultDsci, 1) // 1 min timeout
-		if err != nil && !k8serr.IsAlreadyExists(err) {
+		if err != nil {
 			return err
 		}
 	}