GRBfreeenv, is it needed in case of an error when calling GRBloadenv?

Hey,

So if I got a non zero value when calling GRBloadenv,
Do I need to call GRBfreeenv()? Or is it unnecessary as the memory wasn't allocated.

Also, the same question applies to GRBnewmodel, in case it returns a non-zero value, do I need to call GRBfreemodel?

Thank you,

Guy