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/export-import.cc b/third_party/nix/src/libstore/export-import.cc
index f0af044355..930ff90d26 100644
--- a/third_party/nix/src/libstore/export-import.cc
+++ b/third_party/nix/src/libstore/export-import.cc
@@ -59,7 +59,9 @@ Paths Store::importPaths(Source& source, std::shared_ptr<FSAccessor> accessor,
   Paths res;
   while (true) {
     auto n = readNum<uint64_t>(source);
-    if (n == 0) break;
+    if (n == 0) {
+      break;
+    }
     if (n != 1)
       throw Error(
           "input doesn't look like something created by 'nix-store --export'");
@@ -82,13 +84,17 @@ Paths Store::importPaths(Source& source, std::shared_ptr<FSAccessor> accessor,
     info.references = readStorePaths<PathSet>(*this, source);
 
     info.deriver = readString(source);
-    if (info.deriver != "") assertStorePath(info.deriver);
+    if (info.deriver != "") {
+      assertStorePath(info.deriver);
+    }
 
     info.narHash = hashString(htSHA256, *tee.source.data);
     info.narSize = tee.source.data->size();
 
     // Ignore optional legacy signature.
-    if (readInt(source) == 1) readString(source);
+    if (readInt(source) == 1) {
+      readString(source);
+    }
 
     addToStore(info, tee.source.data, NoRepair, checkSigs, accessor);