Quick fix bgheader detection

Signed-off-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>

Author: zaolin

pkg/intel/metadata/common/bgheader/bgheader.go

@@ -40,16 +40,20 @@ func (bgv BootGuardVersion) String() string {
 
 func DetectBGV(r io.Reader) (BootGuardVersion, error) {
 	var s structInfo
-	var bgv BootGuardVersion
-
 	err := binary.Read(r, binaryOrder, s.ID[:])
 	if err != nil {
 		return 0, fmt.Errorf("unable to read field 'ID': %w", err)
 	}
-	err = binary.Read(r, binaryOrder, bgv)
+	err = binary.Read(r, binaryOrder, s.Version)
 	if err != nil {
 		return 0, fmt.Errorf("unable to read field 'Version': %w", err)
 	}
-
-	return bgv, nil
+	switch s.Version {
+	case 0x10:
+		return Version10, nil
+	case 0x20:
+		return Version20, nil
+	default:
+		return 0, fmt.Errorf("couldn't detect version")
+	}
 }