style(3p/nix): Add braces around single-line for-loops r/772

These were not caught by the previous clang-tidy invocation, but were
instead sorted out using amber[0] as such:

    ambr --regex 'for (\(.+\))\s([a-z].*;)' 'for $1 { $2 }'

[0]: https://github.com/dalance/amber

1 files changed, 3 insertions, 1 deletions

diff --git a/third_party/nix/src/libstore/globals.cc b/third_party/nix/src/libstore/globals.cc
index 4d502c0ade..19a0cde1ed 100644
--- a/third_party/nix/src/libstore/globals.cc
+++ b/third_party/nix/src/libstore/globals.cc
@@ -60,7 +60,9 @@ Settings::Settings()
   auto s = getEnv("NIX_REMOTE_SYSTEMS");
   if (s != "") {
     Strings ss;
-    for (auto& p : tokenizeString<Strings>(s, ":")) ss.push_back("@" + p);
+    for (auto& p : tokenizeString<Strings>(s, ":")) {
+      ss.push_back("@" + p);
+    }
     builders = concatStringsSep(" ", ss);
   }