style(3p/nix): Add braces around single-line conditionals r/771

These were not caught by the previous clang-tidy invocation, but were
instead sorted out using amber[0] as such:

    ambr --regex 'if (\(.+\))\s([a-z].*;)' 'if $1 { $2 }'

[0]: https://github.com/dalance/amber

1 files changed, 4 insertions, 2 deletions

diff --git a/third_party/nix/src/nix-store/dotgraph.cc b/third_party/nix/src/nix-store/dotgraph.cc
index 710d781c7e..259ecbd74a 100644
--- a/third_party/nix/src/nix-store/dotgraph.cc
+++ b/third_party/nix/src/nix-store/dotgraph.cc
@@ -89,7 +89,9 @@ void printDotGraph(ref<Store> store, const PathSet& roots) {
     Path path = *(workList.begin());
     workList.erase(path);
 
-    if (doneSet.find(path) != doneSet.end()) continue;
+    if (doneSet.find(path) != doneSet.end()) {
+      continue;
+    }
     doneSet.insert(path);
 
     cout << makeNode(path, symbolicName(path), "#ff0000");
@@ -118,7 +120,7 @@ void printDotGraph(ref<Store> store, const PathSet& roots) {
             colour = "#00ff00";
             for (StringPairs::iterator i = ne.derivation.env.begin();
                  i != ne.derivation.env.end(); ++i)
-                if (i->first == "name") label = i->second;
+                if (i->first == "name") { label = i->second; }
         }
 
         else if (ne.type == StoreExpr::neClosure) {