fix file descriptor leak in freezer error paths

core/rawdb/freezer_table.go

@@ -158,6 +158,7 @@ func newTable(path string, name string, readMeter, writeMeter metrics.Meter, siz
 		}
 		meta, err = openFreezerFileForReadOnly(filepath.Join(path, fmt.Sprintf("%s.meta", name)))
 		if err != nil {
+			index.Close()
 			return nil, err
 		}
 	} else {
@@ -167,13 +168,16 @@ func newTable(path string, name string, readMeter, writeMeter metrics.Meter, siz
 		}
 		meta, err = openFreezerFileForAppend(filepath.Join(path, fmt.Sprintf("%s.meta", name)))
 		if err != nil {
+			index.Close()
 			return nil, err
 		}
 	}
 	// Load metadata from the file. The tag will be true if legacy metadata
 	// is detected.
 	metadata, err := newMetadata(meta)
 	if err != nil {
+		meta.Close()
+		index.Close()
 		return nil, err
 	}
 	// Create the table and repair any past inconsistency

core/rawdb/freezer_utils.go

@@ -99,6 +99,7 @@ func openFreezerFileForAppend(filename string) (*os.File, error) {
 	}
 	// Seek to end for append
 	if _, err = file.Seek(0, io.SeekEnd); err != nil {
+		file.Close()
 		return nil, err
 	}
 	return file, nil