Return error from NodeGetInfo

This PR checks if NodeGetInfo returns error. If so, it returns
the error. Without this change, it always returns no error (nil)
regardless of whether NodeGetInfo returns error.

pkg/volume/csi/csi_client.go

@@ -95,6 +95,10 @@ func (c *csiDriverClient) NodeGetInfo(ctx context.Context) (
 	nodeClient := csipb.NewNodeClient(conn)
 
 	res, err := nodeClient.NodeGetInfo(ctx, &csipb.NodeGetInfoRequest{})
+	if err != nil {
+		return "", 0, nil, err
+	}
+
 	return res.GetNodeId(), res.GetMaxVolumesPerNode(), res.GetAccessibleTopology(), nil
 }