Fix clang

Summary: Fix build for clang

Test Plan:
USE_CLANG=1 make all -j64
make clean
make check -j64

Reviewers: yhchiang

Subscribers: dhruba

Differential Revision: https://reviews.facebook.net/D50217

util/options_sanity_check.h

@@ -23,7 +23,7 @@ enum OptionsSanityCheckLevel : unsigned char {
 
 // The sanity check level for DB options
 static const std::unordered_map<std::string, OptionsSanityCheckLevel>
-    sanity_level_db_options = {};
+    sanity_level_db_options;
 
 // The sanity check level for column-family options
 static const std::unordered_map<std::string, OptionsSanityCheckLevel>
@@ -35,7 +35,7 @@ static const std::unordered_map<std::string, OptionsSanityCheckLevel>
 
 // The sanity check level for block-based table options
 static const std::unordered_map<std::string, OptionsSanityCheckLevel>
-    sanity_level_bbt_options = {};
+    sanity_level_bbt_options;
 
 OptionsSanityCheckLevel DBOptionSanityCheckLevel(
     const std::string& options_name);