wireguard-tools: remove ? null from inputs, remove with lib;

pkgs/tools/networking/wireguard-tools/default.nix

@@ -1,16 +1,15 @@
-{ lib, stdenv
+{ lib
+, stdenv
 , fetchzip
 , nixosTests
-, iptables ? null
-, iproute ? null
-, makeWrapper ? null
-, openresolv ? null
-, procps ? null
-, wireguard-go ? null
+, iptables
+, iproute
+, makeWrapper
+, openresolv
+, procps
+, wireguard-go
 }:
 
-with lib;
-
 stdenv.mkDerivation rec {
   pname = "wireguard-tools";
   version = "1.0.20210315";
@@ -37,11 +36,11 @@ stdenv.mkDerivation rec {
   postFixup = ''
     substituteInPlace $out/lib/systemd/system/wg-quick@.service \
       --replace /usr/bin $out/bin
-  '' + optionalString stdenv.isLinux ''
+  '' + lib.optionalString stdenv.isLinux ''
     for f in $out/bin/*; do
-      wrapProgram $f --prefix PATH : ${makeBinPath [procps iproute iptables openresolv]}
+      wrapProgram $f --prefix PATH : ${lib.makeBinPath [ procps iproute iptables openresolv ]}
     done
-  '' + optionalString stdenv.isDarwin ''
+  '' + lib.optionalString stdenv.isDarwin ''
     for f in $out/bin/*; do
       wrapProgram $f --prefix PATH : ${wireguard-go}/bin
     done
@@ -52,7 +51,7 @@ stdenv.mkDerivation rec {
     tests = nixosTests.wireguard;
   };
 
-  meta = {
+  meta = with lib; {
     description = "Tools for the WireGuard secure network tunnel";
     downloadPage = "https://git.zx2c4.com/wireguard-tools/refs/";
     homepage = "https://www.wireguard.com/";