fix compile warning
fix compile warning

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