Simplify unmarshalling.

packages/ipp/charsetvalue.go

@@ -45,10 +45,3 @@ func (c *CharSetValue) marshal() []byte {
 func (c *CharSetValue) marshalInto([]byte) int {
 	return 0
 }
-
-func (c *CharSetValue) size() int {
-	l := 1 + 4 // The attribute tag + 2 lengths
-	l += len(c.name)
-	l += len(c.value)
-	return l
-}