table/cuckoo_table_reader.cc: pass func parameter by ref
table/cuckoo_table_reader.cc: pass func parameter by ref

Fix for:

[table/cuckoo_table_reader.cc:198]: (performance) Function
 parameter 'file_data' should be passed by reference.

Signed-off-by: Danny Al-Gaaf <473e39ac77cf392f0dd9bacde8409de76c14d006@bisect.de>

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