Minor: fix a format

Summary: A format fixing

Test Plan: N/A

Reviewers: ljin

Reviewed By: ljin

Subscribers: leveldb

Differential Revision: https://reviews.facebook.net/D21255

db/internal_stats.cc

@@ -94,7 +94,9 @@ DBPropertyType GetPropertyType(const Slice& property, bool* is_int_property,
   Slice prefix("rocksdb.");
   *need_out_of_mutex = false;
   *is_int_property = false;
-  if (!in.starts_with(prefix)) return kUnknown;
+  if (!in.starts_with(prefix)) {
+    return kUnknown;
+  }
   in.remove_prefix(prefix.size());
 
   if (in.starts_with("num-files-at-level")) {