More lint changes, no actual code changes

internal/charset/charset.go

@@ -29,7 +29,7 @@ var (
 	}
 
 	// https://github.com/file/file/blob/fa93fb9f7d21935f1c7644c47d2975d31f12b812/src/encoding.c#L241
-	textChars [256]byte = [256]byte{
+	textChars = [256]byte{
 		/*                  BEL BS HT LF VT FF CR    */
 		F, F, F, F, F, F, F, T, T, T, T, T, T, T, F, F, /* 0x0X */
 		/*                              ESC          */

internal/json/json.go

@@ -74,7 +74,7 @@ type (
 )
 
 // Scan returns the number of bytes scanned and if there was any error
-// in trying to reach the end of data
+// in trying to reach the end of data.
 func Scan(data []byte) (int, error) {
 	s := &scanner{}
 	_ = checkValid(data, s)

internal/magic/binary.go

@@ -139,3 +139,19 @@ func Marc(raw []byte, limit uint32) bool {
 	// Field terminator is present.
 	return bytes.Contains(raw, []byte{0x1E})
 }
+
+// Glb matches a glTF model format file.
+// GLB is the binary file format representation of 3D models save in
+// the GL transmission Format (glTF).
+// see more: https://docs.fileformat.com/3d/glb/
+//           https://www.iana.org/assignments/media-types/model/gltf-binary
+// GLB file format is based on little endian and its header structure
+// show  below:
+//
+// <-- 12-byte header                             -->
+// | magic            | version          | length   |
+// | (uint32)         | (uint32)         | (uint32) |
+// | \x67\x6C\x54\x46 | \x01\x00\x00\x00 | ...      |
+// | g   l   T   F    | 1                | ...      |
+var Glb = prefix([]byte("\x67\x6C\x54\x46\x02\x00\x00\x00"),
+	[]byte("\x67\x6C\x54\x46\x01\x00\x00\x00"))

mime.go

@@ -70,7 +70,6 @@ func newMIME(
 	mime, extension string,
 	detector magic.Detector,
 	children ...*MIME) *MIME {
-
 	m := &MIME{
 		mime:      mime,
 		extension: extension,

mimetype.go

@@ -52,7 +52,7 @@ func DetectReader(r io.Reader) (*MIME, error) {
 			return errMIME, err
 		}
 	} else {
-		n := 0
+		var n int
 		in = make([]byte, l)
 		// io.UnexpectedEOF means len(r) < len(in). It is not an error in this case,
 		// it just means the input file is smaller than the allocated bytes slice.