resolve linter issues

cmd/dmverity-vhd/main.go

@@ -117,7 +117,7 @@ func fetchDirTarball(dirPath string) (imageReader io.ReadCloser, err error) {
 	tmpTarFilePath := filepath.Join(os.TempDir(), "test-layer.tar")
 	layerTar, err := os.Create(tmpTarFilePath)
 	if err != nil {
-		return nil, fmt.Errorf("failed to create output file: %s", err)
+		return nil, fmt.Errorf("failed to create output file: %w", err)
 	}
 	defer os.Remove(tmpTarFilePath)
 
@@ -157,12 +157,12 @@ func fetchDirTarball(dirPath string) (imageReader io.ReadCloser, err error) {
 		return nil
 	})
 	if err != nil {
-		return nil, fmt.Errorf("failed to create tar file from directory: %s", err)
+		return nil, fmt.Errorf("failed to create tar file from directory: %w", err)
 	}
 
 	// Now try to import this tar and verify that there is no failure.
 	if _, err := layerTar.Seek(0, 0); err != nil {
-		return nil, fmt.Errorf("failed to seek file: %s", err)
+		return nil, fmt.Errorf("failed to seek file: %w", err)
 	}
 
 	return layerTar, nil