style(3p/nix): Final act in the brace-wrapping saga r/777

This last change set was generated by a full clang-tidy run (including
compilation):

    clang-tidy -p ~/projects/nix-build/ \
      -checks=-*,readability-braces-around-statements -fix src/*/*.cc

Actually running clang-tidy requires some massaging to make it play
nice with Nix + meson, I'll be adding a wrapper or something for that soon.

1 files changed, 2 insertions, 1 deletions

diff --git a/third_party/nix/src/nix/copy.cc b/third_party/nix/src/nix/copy.cc
index fe5e37363c30..633fe399b48c 100644
--- a/third_party/nix/src/nix/copy.cc
+++ b/third_party/nix/src/nix/copy.cc
@@ -72,8 +72,9 @@ struct CmdCopy : StorePathsCommand {
   }
 
   void run(ref<Store> srcStore, Paths storePaths) override {
-    if (srcUri.empty() && dstUri.empty())
+    if (srcUri.empty() && dstUri.empty()) {
       throw UsageError("you must pass '--from' and/or '--to'");
+    }
 
     ref<Store> dstStore = dstUri.empty() ? openStore() : openStore(dstUri);