Function krb5_sys::krb5_k_decrypt_iov

pub unsafe extern fn krb5_k_decrypt_iov(context: krb5_context,
                                        key: krb5_key,
                                        usage: krb5_keyusage,
                                        cipher_state: *const krb5_data,
                                        data: *mut krb5_crypto_iov,
                                        num_data: usize)
                                        -> krb5_error_code