refactor(3p/nix): Apply clang-tidy's performance-* fixes r/789

This applies the performance fixes listed here:

https://clang.llvm.org/extra/clang-tidy/checks/list.html

1 files changed, 2 insertions, 2 deletions

diff --git a/third_party/nix/src/nix-env/nix-env.cc b/third_party/nix/src/nix-env/nix-env.cc
index ec2da8f835..95a395a96f 100644
--- a/third_party/nix/src/nix-env/nix-env.cc
+++ b/third_party/nix/src/nix-env/nix-env.cc
@@ -171,8 +171,8 @@ static void loadSourceExpr(EvalState& state, const Path& path, Value& v) {
   }
 }
 
-static void loadDerivations(EvalState& state, Path nixExprPath,
-                            string systemFilter, Bindings& autoArgs,
+static void loadDerivations(EvalState& state, const Path& nixExprPath,
+                            const string& systemFilter, Bindings& autoArgs,
                             const string& pathPrefix, DrvInfos& elems) {
   Value vRoot;
   loadSourceExpr(state, nixExprPath, vRoot);