Simplify unmarshalling.

packages/ipp/naturallanguage.go

@@ -41,10 +41,3 @@ func (c *NaturalLanguage) marshal() []byte {
 	marshalNameValue(c.name, c.value, b[1:])
 	return b
 }
-
-func (c *NaturalLanguage) size() int {
-	l := 1 + 4 // The attribute tag + 2 lengths
-	l += len(c.name)
-	l += len(c.value)
-	return l
-}