Fix volumes

configuration.nix

@@ -9,6 +9,7 @@ in
     ./variables-module.nix
     ./variables.nix
     ./files.nix
+    ./volumes.nix
     ./users.nix
     ./mailserver/system/mailserver.nix
     ./vpn/ocserv.nix

volumes.nix

@@ -3,15 +3,15 @@ let
   cfg = config.services.userdata;
 in
 {
-  fileSystems = {
-    builtins.listToAttrs (builtins.map
-      (volume: {
-        name: "${volume.mountPoint}";
-        value: {
+  fileSystems =
+    builtins.listToAttrs
+      (builtins.map
+        (volume: {
+          name: "${volume.mountPoint}";
+          value: {
           device = "${volume.device}";
           fsType = "${volume.fsType}";
         };
-      })
-    cfg.volumes);
-  }
+        })
+  cfg.volumes);
 }