systemd: nixpkgs-fmt

This was recently introduced, and apparently not nixpkgs-fmt'ed.

While there's no global consensus on nixpkgs-fmt'ing everything,
indenting this by 2 more spaces won't hurt.

pkgs/os-specific/linux/systemd/default.nix

@@ -160,8 +160,8 @@ stdenv.mkDerivation {
       --replace \
       "find_program('objcopy'" \
       "find_program('${stdenv.cc.bintools.targetPrefix}objcopy'"
-  '' + (let
-
+  '' + (
+    let
       # The folllowing dlopen patches ensure that all the features that are
       # implemented via dlopen(3) are available (or explicitly deactivated) by
       # pointing dlopen to the absolute store path instead of relying on the
@@ -215,9 +215,11 @@ stdenv.mkDerivation {
         { name = "libpcre2-8.so.0"; pkg = pcre2; }
       ];
 
-    patchDlOpen = dl: let
+      patchDlOpen = dl:
+        let
           library = "${lib.makeLibraryPath [ dl.pkg ]}/${dl.name}";
-    in if dl.pkg == null then ''
+        in
+        if dl.pkg == null then ''
           # remove the dependency on the library by replacing it with an invalid path
           for file in $(grep -lr 'dlopen("${dl.name}"' src); do
             echo "patching dlopen(\"${dl.name}\", …) in $file to an invalid store path ("/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-not-implemented/${dl.name}")…"
@@ -235,8 +237,10 @@ stdenv.mkDerivation {
             substituteInPlace "$file" --replace 'dlopen("${dl.name}"' 'dlopen("${library}"'
           done
         '';
-  in # patch all the dlopen calls to contain absolute paths to the libraries
-  lib.concatMapStringsSep "\n" patchDlOpen dlopenLibs)
+    in
+    # patch all the dlopen calls to contain absolute paths to the libraries
+    lib.concatMapStringsSep "\n" patchDlOpen dlopenLibs
+  )
   # finally ensure that there are no left-over dlopen calls that we didn't handle
   + ''
     if grep -qr 'dlopen("[^/]' src; then