Fixed compile warning in compact_files_example.cc
Fixed compile warning in compact_files_example.cc

Summary: Fixed compile warning in compact_files_example.cc

Test Plan: compact_files_example

Reviewers: sdong, igor

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D39309

ylong/rocksdb,ylong/rocksdb,Applied-Duality/rocksdb,Vaisman/rocksdb,flabby/rocksdb,wat-ze-hex/rocksdb,dkorolev/rocksdb,hobinyoon/rocksdb,facebook/rocksdb,SunguckLee/RocksDB,vmx/rocksdb,IMCG/RcoksDB,wlqGit/rocksdb,JackLian/rocksdb,tizzybec/rocksdb,OverlordQ/rocksdb,JoeWoo/rocksdb,Applied-Duality/rocksdb,wat-ze-hex/rocksdb,Vaisman/rocksdb,geraldoandradee/rocksdb,JoeWoo/rocksdb,caijieming-baidu/rocksdb,jalexanderqed/rocksdb,norton/rocksdb,temicai/rocksdb,luckywhu/rocksdb,temicai/rocksdb,lgscofield/rocksdb,JackLian/rocksdb,alihalabyah/rocksdb,Vaisman/rocksdb,Vaisman/rocksdb,JohnPJenkins/rocksdb,tizzybec/rocksdb,vmx/rocksdb,Vaisman/rocksdb,makelivedotnet/rocksdb,JoeWoo/rocksdb,JoeWoo/rocksdb,RyanTech/rocksdb,jalexanderqed/rocksdb,vmx/rocksdb,dkorolev/rocksdb,bbiao/rocksdb,tsheasha/rocksdb,geraldoandradee/rocksdb,tizzybec/rocksdb,JackLian/rocksdb,wat-ze-hex/rocksdb,caijieming-baidu/rocksdb,temicai/rocksdb,fengshao0907/rocksdb,SunguckLee/RocksDB,siddhartharay007/rocksdb,ylong/rocksdb,tizzybec/rocksdb,sorphi/rocksdb,hobinyoon/rocksdb,wskplho/rocksdb,skunkwerks/rocksdb,tizzybec/rocksdb,biddyweb/rocksdb,lgscofield/rocksdb,Andymic/rocksdb,wat-ze-hex/rocksdb,vashstorm/rocksdb,ryneli/rocksdb,jalexanderqed/rocksdb,wat-ze-hex/rocksdb,wlqGit/rocksdb,luckywhu/rocksdb,bbiao/rocksdb,fengshao0907/rocksdb,zhangpng/rocksdb,alihalabyah/rocksdb,bbiao/rocksdb,rDSN-Projects/rocksdb.replicated,RyanTech/rocksdb,OverlordQ/rocksdb,wenduo/rocksdb,flabby/rocksdb,makelivedotnet/rocksdb,makelivedotnet/rocksdb,tizzybec/rocksdb,IMCG/RcoksDB,kaschaeffer/rocksdb,mbarbon/rocksdb,tsheasha/rocksdb,OverlordQ/rocksdb,wskplho/rocksdb,alihalabyah/rocksdb,JohnPJenkins/rocksdb,biddyweb/rocksdb,bbiao/rocksdb,lgscofield/rocksdb,bbiao/rocksdb,tizzybec/rocksdb,luckywhu/rocksdb,ryneli/rocksdb,hobinyoon/rocksdb,anagav/rocksdb,flabby/rocksdb,lgscofield/rocksdb,OverlordQ/rocksdb,mbarbon/rocksdb,biddyweb/rocksdb,temicai/rocksdb,rDSN-Projects/rocksdb.replicated,rDSN-Projects/rocksdb.replicated,vashstorm/rocksdb,SunguckLee/RocksDB,wlqGit/rocksdb,lgscofield/rocksdb,Andymic/rocksdb,JohnPJenkins/rocksdb,siddhartharay007/rocksdb,kaschaeffer/rocksdb,wat-ze-hex/rocksdb,vmx/rocksdb,bbiao/rocksdb,IMCG/RcoksDB,luckywhu/rocksdb,ryneli/rocksdb,sorphi/rocksdb,zhangpng/rocksdb,ryneli/rocksdb,SunguckLee/RocksDB,zhangpng/rocksdb,alihalabyah/rocksdb,mbarbon/rocksdb,bbiao/rocksdb,makelivedotnet/rocksdb,tsheasha/rocksdb,facebook/rocksdb,wat-ze-hex/rocksdb,JohnPJenkins/rocksdb,SunguckLee/RocksDB,luckywhu/rocksdb,SunguckLee/RocksDB,vashstorm/rocksdb,makelivedotnet/rocksdb,sorphi/rocksdb,zhangpng/rocksdb,caijieming-baidu/rocksdb,siddhartharay007/rocksdb,jalexanderqed/rocksdb,dkorolev/rocksdb,luckywhu/rocksdb,anagav/rocksdb,wenduo/rocksdb,skunkwerks/rocksdb,caijieming-baidu/rocksdb,geraldoandradee/rocksdb,norton/rocksdb,vmx/rocksdb,sorphi/rocksdb,flabby/rocksdb,wskplho/rocksdb,mbarbon/rocksdb,sorphi/rocksdb,JoeWoo/rocksdb,skunkwerks/rocksdb,norton/rocksdb,wat-ze-hex/rocksdb,kaschaeffer/rocksdb,ylong/rocksdb,IMCG/RcoksDB,skunkwerks/rocksdb,anagav/rocksdb,wlqGit/rocksdb,JackLian/rocksdb,wlqGit/rocksdb,rDSN-Projects/rocksdb.replicated,caijieming-baidu/rocksdb,flabby/rocksdb,tsheasha/rocksdb,kaschaeffer/rocksdb,wenduo/rocksdb,hobinyoon/rocksdb,JohnPJenkins/rocksdb,vashstorm/rocksdb,ylong/rocksdb,JohnPJenkins/rocksdb,geraldoandradee/rocksdb,kaschaeffer/rocksdb,Andymic/rocksdb,vmx/rocksdb,alihalabyah/rocksdb,ylong/rocksdb,fengshao0907/rocksdb,anagav/rocksdb,zhangpng/rocksdb,Applied-Duality/rocksdb,norton/rocksdb,wenduo/rocksdb,wenduo/rocksdb,jalexanderqed/rocksdb,rDSN-Projects/rocksdb.replicated,anagav/rocksdb,mbarbon/rocksdb,siddhartharay007/rocksdb,anagav/rocksdb,zhangpng/rocksdb,Andymic/rocksdb,wenduo/rocksdb,alihalabyah/rocksdb,temicai/rocksdb,wskplho/rocksdb,fengshao0907/rocksdb,dkorolev/rocksdb,skunkwerks/rocksdb,RyanTech/rocksdb,kaschaeffer/rocksdb,facebook/rocksdb,Andymic/rocksdb,fengshao0907/rocksdb,Vaisman/rocksdb,facebook/rocksdb,facebook/rocksdb,OverlordQ/rocksdb,JackLian/rocksdb,JoeWoo/rocksdb,temicai/rocksdb,lgscofield/rocksdb,sorphi/rocksdb,kaschaeffer/rocksdb,norton/rocksdb,siddhartharay007/rocksdb,temicai/rocksdb,vashstorm/rocksdb,flabby/rocksdb,dkorolev/rocksdb,rDSN-Projects/rocksdb.replicated,alihalabyah/rocksdb,dkorolev/rocksdb,SunguckLee/RocksDB,dkorolev/rocksdb,facebook/rocksdb,wskplho/rocksdb,fengshao0907/rocksdb,hobinyoon/rocksdb,tsheasha/rocksdb,RyanTech/rocksdb,Andymic/rocksdb,luckywhu/rocksdb,IMCG/RcoksDB,geraldoandradee/rocksdb,IMCG/RcoksDB,wenduo/rocksdb,hobinyoon/rocksdb,hobinyoon/rocksdb,biddyweb/rocksdb,vmx/rocksdb,RyanTech/rocksdb,vashstorm/rocksdb,jalexanderqed/rocksdb,Applied-Duality/rocksdb,jalexanderqed/rocksdb,tsheasha/rocksdb,JohnPJenkins/rocksdb,JackLian/rocksdb,ryneli/rocksdb,facebook/rocksdb,ylong/rocksdb,lgscofield/rocksdb,tsheasha/rocksdb,Vaisman/rocksdb,facebook/rocksdb,biddyweb/rocksdb,zhangpng/rocksdb,mbarbon/rocksdb,hobinyoon/rocksdb,OverlordQ/rocksdb,bbiao/rocksdb,geraldoandradee/rocksdb,JackLian/rocksdb,siddhartharay007/rocksdb,caijieming-baidu/rocksdb,rDSN-Projects/rocksdb.replicated,fengshao0907/rocksdb,Applied-Duality/rocksdb,sorphi/rocksdb,wlqGit/rocksdb,IMCG/RcoksDB,flabby/rocksdb,caijieming-baidu/rocksdb,geraldoandradee/rocksdb,RyanTech/rocksdb,wskplho/rocksdb,ryneli/rocksdb,skunkwerks/rocksdb,biddyweb/rocksdb,Andymic/rocksdb,Applied-Duality/rocksdb,tsheasha/rocksdb,biddyweb/rocksdb,mbarbon/rocksdb,Applied-Duality/rocksdb,ryneli/rocksdb,anagav/rocksdb,siddhartharay007/rocksdb,wskplho/rocksdb,OverlordQ/rocksdb,vmx/rocksdb,makelivedotnet/rocksdb,makelivedotnet/rocksdb,wlqGit/rocksdb,vashstorm/rocksdb,norton/rocksdb,norton/rocksdb,wenduo/rocksdb,Andymic/rocksdb,RyanTech/rocksdb,skunkwerks/rocksdb,JoeWoo/rocksdb,SunguckLee/RocksDB,norton/rocksdb