See if this silences CodeQL (#1129)

* Fix building on 32-bit systems

* Try this to appease CodeQL

* Trying one more option to see if CodeQL is happy

* Maybe needed this too?

* Simplify

---------

Co-authored-by: ItalyPaleAle <43508+ItalyPaleAle@users.noreply.github.com>

jwt/openid/birthdate.go

@@ -61,18 +61,17 @@ func (b *BirthdateClaim) UnmarshalJSON(data []byte) error {
 var intSize int
 
 func init() {
-	switch math.MaxInt {
-	case math.MaxInt16:
-		intSize = 16
-	case math.MaxInt32:
+	intSize = 64
+	if math.MaxInt == math.MaxInt32 {
 		intSize = 32
-	case math.MaxInt64:
-		intSize = 64
 	}
 }
 
 func parseBirthdayInt(s string) int {
-	i, _ := strconv.ParseInt(s, 10, intSize)
+	i, err := strconv.ParseInt(s, 10, intSize)
+	if err != nil {
+		return 0
+	}
 	return int(i)
 }