3 files changed, 2 insertions, 9 deletions
diff --git a/src/device/mod.rs b/src/device/mod.rs
index 067fdf6..c84faa1 100644
--- a/src/device/mod.rs
+++ b/src/device/mod.rs
@@ -10,8 +10,6 @@ use std::ffi;
 use std::fmt;
 use std::str;
 
-use nitrokey_sys;
-
 use crate::auth::Authenticate;
 use crate::config::{Config, RawConfig};
 use crate::error::{CommunicationError, Error, LibraryError};
@@ -225,9 +223,8 @@ fn get_hidapi_serial_number(serial_number: &str) -> Option<SerialNumber> {
         return None;
     }
 
-    let iter = serial_number.char_indices().rev();
-    let first_non_null = iter.skip_while(|(_, c)| *c == '0').next();
-    if let Some((i, _)) = first_non_null {
+    let mut iter = serial_number.char_indices().rev();
+    if let Some((i, _)) = iter.find(|(_, c)| *c != '0') {
         let substr = if len - i < 8 {
             // The last eight characters contain at least one non-zero character --> use them
             serial_number.split_at(len - 8).1
diff --git a/src/device/pro.rs b/src/device/pro.rs
index 591b730..0d5443e 100644
--- a/src/device/pro.rs
+++ b/src/device/pro.rs
@@ -1,8 +1,6 @@
 // Copyright (C) 2018-2019 Robin Krahl <robin.krahl@ireas.org>
 // SPDX-License-Identifier: MIT
 
-use nitrokey_sys;
-
 use crate::device::{Device, Model, Status};
 use crate::error::Error;
 use crate::otp::GenerateOtp;
diff --git a/src/device/storage.rs b/src/device/storage.rs
index 5669a91..a18d94f 100644
--- a/src/device/storage.rs
+++ b/src/device/storage.rs
@@ -5,8 +5,6 @@ use std::convert::TryFrom as _;
 use std::fmt;
 use std::ops;
 
-use nitrokey_sys;
-
 use crate::device::{Device, FirmwareVersion, Model, SerialNumber, Status};
 use crate::error::{CommandError, Error};
 use crate::otp::GenerateOtp;