remove extra indentation and let

nixos/modules/issuer.nix

@@ -3,6 +3,7 @@
 { lib, pkgs, config, ... }: let
   pspkgs = pkgs.callPackage ./pspkgs.nix { };
   zkapissuer = pspkgs.callPackage ../pkgs/zkapissuer.nix { };
+  cfg = config.services.private-storage-issuer;
 in {
   options = {
     services.private-storage-issuer.enable = lib.mkEnableOption "PrivateStorage ZKAP Issuer Service";
@@ -33,10 +34,7 @@ in {
     };
   };
 
-  config = let
-    cfg = config.services.private-storage-issuer;
-  in
-    lib.mkIf cfg.enable {
+  config = lib.mkIf cfg.enable {
     systemd.services.zkapissuer = {
       enable = true;
       description = "ZKAP Issuer";