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/libstore/remote-fs-accessor.hh b/third_party/nix/src/libstore/remote-fs-accessor.hh
index 08985de529..32c729f50d 100644
--- a/third_party/nix/src/libstore/remote-fs-accessor.hh
+++ b/third_party/nix/src/libstore/remote-fs-accessor.hh
@@ -20,10 +20,10 @@ class RemoteFSAccessor : public FSAccessor {
   Path makeCacheFile(const Path& storePath, const std::string& ext);
 
   void addToCache(const Path& storePath, const std::string& nar,
-                  ref<FSAccessor> narAccessor);
+                  const ref<FSAccessor>& narAccessor);
 
  public:
-  RemoteFSAccessor(ref<Store> store,
+  RemoteFSAccessor(const ref<Store>& store,
                    const /* FIXME: use std::optional */ Path& cacheDir = "");
 
   Stat stat(const Path& path) override;