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, 9 insertions, 3 deletions

diff --git a/third_party/nix/src/libstore/pathlocks.cc b/third_party/nix/src/libstore/pathlocks.cc
index d71717e73e..ffec3d7d7e 100644
--- a/third_party/nix/src/libstore/pathlocks.cc
+++ b/third_party/nix/src/libstore/pathlocks.cc
@@ -57,8 +57,12 @@ bool lockFile(int fd, LockType lockType, bool wait) {
   } else {
     while (flock(fd, type | LOCK_NB) != 0) {
       checkInterrupt();
-      if (errno == EWOULDBLOCK) return false;
-      if (errno != EINTR) throw SysError(format("acquiring/releasing lock"));
+      if (errno == EWOULDBLOCK) {
+        return false;
+      }
+      if (errno != EINTR) {
+        throw SysError(format("acquiring/releasing lock"));
+      }
     }
   }
 
@@ -143,7 +147,9 @@ PathLocks::~PathLocks() {
 
 void PathLocks::unlock() {
   for (auto& i : fds) {
-    if (deletePaths) deleteLockFile(i.second, i.first);
+    if (deletePaths) {
+      deleteLockFile(i.second, i.first);
+    }
 
     if (close(i.first) == -1) {
       LOG(WARNING) << "cannot close lock file on '" << i.second << "'";