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, 3 insertions, 1 deletions

diff --git a/third_party/nix/src/libstore/parsed-derivations.cc b/third_party/nix/src/libstore/parsed-derivations.cc
index 6a8c235a0c..29133664fd 100644
--- a/third_party/nix/src/libstore/parsed-derivations.cc
+++ b/third_party/nix/src/libstore/parsed-derivations.cc
@@ -100,7 +100,9 @@ bool ParsedDerivation::canBuildLocally() const {
     return false;
 
   for (auto& feature : getRequiredSystemFeatures())
-    if (!settings.systemFeatures.get().count(feature)) return false;
+    if (!settings.systemFeatures.get().count(feature)) {
+      return false;
+    }
 
   return true;
 }