Missing destructor for rnp_op_verify_signature_t ?

[csoler]

Description

Most functions in RNP return opaque structures that need to be destroyed by the user using a *_destroy function.
It seems however that rnp_op_verify_signature_t doesn't have a corresponding destructor (although it is a pointer).

Is that on purpose?

[ni4]

Thanks for noticing this! Yes, this is on purpose as handle would point to some internal structure (from the code: *sig = &op->signatures_[idx]; ).
Made PR to update the documentation as well: #2258