Clean up sun.security.krb5.PrincipalName::toByteArray

SonarCloud actually found this:
  Verify this is the index that was intended; it was already set before.
 
    public byte[][] toByteArray() {
        byte[][] result = new byte[nameStrings.length][];
        for (int i = 0; i < nameStrings.length; i++) {
            result[i] = new byte[nameStrings[i].length()]; // <-- here
            result[i] = nameStrings[i].getBytes();
        }
        return result;
    }

`getBytes()` returns the `byte[]` array, there is no need to allocate the array before it.