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, 6 insertions, 2 deletions

diff --git a/third_party/nix/src/nix/command.cc b/third_party/nix/src/nix/command.cc
index cf109c4416..1825bb6136 100644
--- a/third_party/nix/src/nix/command.cc
+++ b/third_party/nix/src/nix/command.cc
@@ -62,8 +62,12 @@ void MultiCommand::printHelp(const string& programName, std::ostream& out) {
 }
 
 bool MultiCommand::processFlag(Strings::iterator& pos, Strings::iterator end) {
-  if (Args::processFlag(pos, end)) return true;
-  if (command && command->processFlag(pos, end)) return true;
+  if (Args::processFlag(pos, end)) {
+    return true;
+  }
+  if (command && command->processFlag(pos, end)) {
+    return true;
+  }
   return false;
 }