Function sequoia_octopus_librnp::op_verify::rnp_op_verify_get_recipient_at

#[no_mangle]
pub unsafe extern "C" fn rnp_op_verify_get_recipient_at(
    op: *mut RnpOpVerify<'_>,
    idx: size_t,
    pkesk: *mut *const PKESK
) -> RnpResult