Remove redundant type cast

v2/id3v22.go

@@ -110,7 +110,7 @@ func ParseV22Frame(reader io.Reader) Framer {
 
 	h := FrameHead{
 		FrameType: t,
-		size:      uint32(size),
+		size:      size,
 	}
 
 	frameData := make([]byte, size)

v2/id3v23.go

@@ -138,7 +138,7 @@ func ParseV23Frame(reader io.Reader) Framer {
 		FrameType:   t,
 		statusFlags: data[8],
 		formatFlags: data[9],
-		size:        uint32(size),
+		size:        size,
 	}
 
 	frameData := make([]byte, size)