nixfmt-rfc-style

There is nothing in this commit except for the changes made by
nix-shell -p nixfmt-rfc-style --run "nixfmt ."

If this has mucked up your open branches then sorry about that. You
can probably nixfmt them to match before merging

pkgs/kernel/write-kconfig.nix

@@ -1,11 +1,12 @@
 {
-  lib
-, writeText
+  lib,
+  writeText,
 }:
-name : config: writeText name
-  (builtins.concatStringsSep
-    "\n"
-    (lib.mapAttrsToList
-      (name: value: (if value == "n" then "# CONFIG_${name} is not set" else "CONFIG_${name}=${value}"))
-      config
-    ))
+name: config:
+writeText name (
+  builtins.concatStringsSep "\n" (
+    lib.mapAttrsToList (
+      name: value: (if value == "n" then "# CONFIG_${name} is not set" else "CONFIG_${name}=${value}")
+    ) config
+  )
+)