Refactor Ufid -> UFID

id3v2.go

@@ -226,7 +226,7 @@ func readID3v2Frames(r io.Reader, h *ID3v2Header) (map[string]interface{}, error
 			result[rawName] = txt
 
 		case name == "UFID" || name == "UFI":
-			t, err := readUfid(b)
+			t, err := readUFID(b)
 			if err != nil {
 				return nil, err
 			}

id3v2frames.go

@@ -195,21 +195,21 @@ func readTextWithDescrFrame(b []byte, hasLang bool, encoded bool) (*Comm, error)
 	}, nil
 }
 
-// UFID is composed of a provider (frequently an URL and a binary identifier)
+// UFID is composed of a provider (frequently a URL and a binary identifier)
 // The identifier can be a text (Musicbrainz use texts, but not necessary)
-type Ufid struct {
+type UFID struct {
 	Provider   string
 	Identifier []byte
 }
 
-func (u Ufid) String() string {
+func (u UFID) String() string {
 	return fmt.Sprintf("%v (%v)", u.Provider, string(u.Identifier))
 }
 
-func readUfid(b []byte) (*Ufid, error) {
+func readUFID(b []byte) (*UFID, error) {
 	result := bytes.SplitN(b, []byte{0}, 2)
 
-	return &Ufid{
+	return &UFID{
 		Provider:   string(result[0]),
 		Identifier: result[1],
 	}, nil