Fix memory leak in table.cc
Fix memory leak in table.cc

Summary:
In InternalGet, BlockReader returns an Iterator which is legitimately freed at the end of the 'else' scope. BUT there is a break statement in between and must be freed there too!
The best solution would be to move to unique_ptr and let it handle. Changed it to a unique_ptr.

Test Plan: valgrind ./db_test;make all check

Reviewers: dhruba, haobo

Reviewed By: dhruba

CC: leveldb

Differential Revision: https://reviews.facebook.net/D12681

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