chore(dataobj): fix compilation error following #18622 (#18738)

Author: rfratto

pkg/dataobj/metastore/object_test.go

@@ -272,21 +272,23 @@ func TestSectionsForStreamMatchers(t *testing.T) {
 		require.NoError(t, err)
 	}
 
-	buf := bytes.NewBuffer(make([]byte, 0, 1024*1024))
-	stats, err := builder.Flush(buf)
+	minTime, maxTime := builder.TimeRange()
+
+	obj, closer, err := builder.Flush()
 	require.NoError(t, err)
+	t.Cleanup(func() { _ = closer.Close() })
 
 	bucket := objstore.NewInMemBucket()
 
 	uploader := uploader.New(uploader.Config{SHAPrefixSize: 2}, bucket, tenantID, log.NewNopLogger())
 	require.NoError(t, uploader.RegisterMetrics(prometheus.NewPedanticRegistry()))
 
-	path, err := uploader.Upload(context.Background(), buf)
+	path, err := uploader.Upload(context.Background(), obj)
 	require.NoError(t, err)
 
 	metastoreUpdater := NewUpdater(UpdaterConfig{}, bucket, tenantID, log.NewNopLogger())
 
-	err = metastoreUpdater.Update(context.Background(), path, stats.MinTimestamp, stats.MaxTimestamp)
+	err = metastoreUpdater.Update(context.Background(), path, minTime, maxTime)
 	require.NoError(t, err)
 
 	mstore := NewObjectMetastore(bucket, log.NewNopLogger(), prometheus.NewPedanticRegistry())