Fix file close issue in compress function

Signed-off-by: Hang Yan <[email protected]>

Author: hangyan

pkg/util/compress/compress.go

@@ -33,7 +33,9 @@ var (
 func PackDir(dir string, writer io.Writer) ([]byte, error) {
 	hash := sha256.New()
 	gzWriter := gzip.NewWriter(io.MultiWriter(hash, writer))
+	defer gzWriter.Close()
 	targzWriter := tar.NewWriter(gzWriter)
+	defer targzWriter.Close()
 	err := afero.Walk(defaultFS, dir, func(filePath string, info os.FileInfo, err error) error {
 		if err != nil {
 			return err
@@ -61,7 +63,6 @@ func PackDir(dir string, writer io.Writer) ([]byte, error) {
 	if err != nil {
 		return nil, err
 	}
-	targzWriter.Close()
-	gzWriter.Close()
+
 	return hash.Sum(nil), nil
 }