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, 6 insertions, 2 deletions

diff --git a/third_party/nix/src/nix/doctor.cc b/third_party/nix/src/nix/doctor.cc
index e4138f28d88c..cf59aabdbda6 100644
--- a/third_party/nix/src/nix/doctor.cc
+++ b/third_party/nix/src/nix/doctor.cc
@@ -52,7 +52,9 @@ struct CmdDoctor : StoreCommand {
       std::cout << "Warning: multiple versions of nix found in PATH."
                 << std::endl;
       std::cout << std::endl;
-      for (auto& dir : dirs) std::cout << "  " << dir << std::endl;
+      for (auto& dir : dirs) {
+        std::cout << "  " << dir << std::endl;
+      }
       std::cout << std::endl;
       return false;
     }
@@ -90,7 +92,9 @@ struct CmdDoctor : StoreCommand {
       std::cout << "garbage collected, resulting in broken symlinks."
                 << std::endl;
       std::cout << std::endl;
-      for (auto& dir : dirs) std::cout << "  " << dir << std::endl;
+      for (auto& dir : dirs) {
+        std::cout << "  " << dir << std::endl;
+      }
       std::cout << std::endl;
       return false;
     }