FlatWithOctetsFW.lengthOctets2 is checking for unnecessary low value

[akrambek]

In line 269 of FlatWithOctetsFW.lengthOctets2 method there is unnecessary checking which will never be triggered as it is private. Since there is no way enforce that line it should be deleted.

if (value < 0) {
        throw new IllegalArgumentException(String.format("Value %d too low for field \"lengthOctets2\"", value));
      }