Fixed old lint errors in db/filename.h
Fixed old lint errors in db/filename.h

Summary: Fixed old lint errors in db/filename.h

Test Plan: make

Reviewers: igor, sdong, anthony, IslamAbdelRahman

Reviewed By: IslamAbdelRahman

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D47439

jalexanderqed/rocksdb,norton/rocksdb,jalexanderqed/rocksdb,kaschaeffer/rocksdb,facebook/rocksdb,facebook/rocksdb,hobinyoon/rocksdb,OverlordQ/rocksdb,bbiao/rocksdb,norton/rocksdb,flabby/rocksdb,ryneli/rocksdb,flabby/rocksdb,Andymic/rocksdb,jalexanderqed/rocksdb,flabby/rocksdb,hobinyoon/rocksdb,jalexanderqed/rocksdb,ryneli/rocksdb,vmx/rocksdb,biddyweb/rocksdb,tsheasha/rocksdb,hobinyoon/rocksdb,Andymic/rocksdb,caijieming-baidu/rocksdb,bbiao/rocksdb,luckywhu/rocksdb,tsheasha/rocksdb,Vaisman/rocksdb,ryneli/rocksdb,biddyweb/rocksdb,ryneli/rocksdb,norton/rocksdb,wat-ze-hex/rocksdb,vmx/rocksdb,luckywhu/rocksdb,bbiao/rocksdb,geraldoandradee/rocksdb,wat-ze-hex/rocksdb,wenduo/rocksdb,facebook/rocksdb,OverlordQ/rocksdb,biddyweb/rocksdb,ryneli/rocksdb,kaschaeffer/rocksdb,luckywhu/rocksdb,tsheasha/rocksdb,wenduo/rocksdb,wat-ze-hex/rocksdb,Vaisman/rocksdb,bbiao/rocksdb,bbiao/rocksdb,luckywhu/rocksdb,Andymic/rocksdb,tsheasha/rocksdb,flabby/rocksdb,caijieming-baidu/rocksdb,Andymic/rocksdb,norton/rocksdb,kaschaeffer/rocksdb,tsheasha/rocksdb,norton/rocksdb,geraldoandradee/rocksdb,wat-ze-hex/rocksdb,vmx/rocksdb,wenduo/rocksdb,hobinyoon/rocksdb,wenduo/rocksdb,Vaisman/rocksdb,kaschaeffer/rocksdb,geraldoandradee/rocksdb,norton/rocksdb,Vaisman/rocksdb,bbiao/rocksdb,wenduo/rocksdb,SunguckLee/RocksDB,norton/rocksdb,Andymic/rocksdb,kaschaeffer/rocksdb,kaschaeffer/rocksdb,bbiao/rocksdb,OverlordQ/rocksdb,hobinyoon/rocksdb,ryneli/rocksdb,hobinyoon/rocksdb,luckywhu/rocksdb,kaschaeffer/rocksdb,facebook/rocksdb,vmx/rocksdb,wat-ze-hex/rocksdb,Andymic/rocksdb,vmx/rocksdb,vmx/rocksdb,facebook/rocksdb,Vaisman/rocksdb,geraldoandradee/rocksdb,Andymic/rocksdb,caijieming-baidu/rocksdb,bbiao/rocksdb,vmx/rocksdb,facebook/rocksdb,Andymic/rocksdb,biddyweb/rocksdb,caijieming-baidu/rocksdb,wenduo/rocksdb,facebook/rocksdb,wenduo/rocksdb,Vaisman/rocksdb,Vaisman/rocksdb,jalexanderqed/rocksdb,vmx/rocksdb,geraldoandradee/rocksdb,wenduo/rocksdb,jalexanderqed/rocksdb,luckywhu/rocksdb,ryneli/rocksdb,OverlordQ/rocksdb,luckywhu/rocksdb,jalexanderqed/rocksdb,flabby/rocksdb,tsheasha/rocksdb,wat-ze-hex/rocksdb,geraldoandradee/rocksdb,SunguckLee/RocksDB,SunguckLee/RocksDB,facebook/rocksdb,biddyweb/rocksdb,SunguckLee/RocksDB,wat-ze-hex/rocksdb,tsheasha/rocksdb,OverlordQ/rocksdb,wat-ze-hex/rocksdb,hobinyoon/rocksdb,biddyweb/rocksdb,caijieming-baidu/rocksdb,biddyweb/rocksdb,tsheasha/rocksdb,geraldoandradee/rocksdb,SunguckLee/RocksDB,caijieming-baidu/rocksdb,flabby/rocksdb,flabby/rocksdb,norton/rocksdb,caijieming-baidu/rocksdb,SunguckLee/RocksDB,SunguckLee/RocksDB,OverlordQ/rocksdb,OverlordQ/rocksdb,hobinyoon/rocksdb,SunguckLee/RocksDB