style(3p/nix): Enforce braces around loops and conditionals r/767

This change was generated with:

  fd -e cc -e hh | xargs -I{} clang-tidy {} -p ~/projects/nix-build/ \
    --checks='-*,readability-braces-around-statements' --fix \
    -fix-errors

Some manual fixes were applied because some convoluted unbraced
statements couldn't be untangled by clang-tidy.

This commit still includes invalid files, but I decided to clean them
up in a subsequent commit so that it becomes more obvious where
clang-tidy failed. Maybe this will allow for a bug-report to
clang-tidy.

1 files changed, 3 insertions, 1 deletions

diff --git a/third_party/nix/src/nix/legacy.hh b/third_party/nix/src/nix/legacy.hh
index 09a1022181..a9bc65c02e 100644
--- a/third_party/nix/src/nix/legacy.hh
+++ b/third_party/nix/src/nix/legacy.hh
@@ -13,7 +13,9 @@ struct RegisterLegacyCommand {
   static Commands* commands;
 
   RegisterLegacyCommand(const std::string& name, MainFunction fun) {
-    if (!commands) commands = new Commands;
+    if (!commands) {
+      commands = new Commands;
+    }
     (*commands)[name] = fun;
   }
 };