Do not call C_Finalize if not initialized

[Geobert]

Hi,

I’m in a mixed env with Rust code used in a C++ program. C++ side initialize the pkcs11 lib so Rust side can’t.
If Rust side calls C_Finalize, I get a random crash, which, I think, is because of a double free?

[hug-dev]

Hello! Sorry for the long time without answer!

C_Finalize is called when then Pkcs11 instance is dropped. We could potentially add a new constructor which builds an instance that does not auto-finalize :)