For ENG-5865, fix another buggy double free check in DBBPool
For ENG-5865, fix another buggy double free check in DBBPool

ingted/voltdb,kumarrus/voltdb,simonzhangsm/voltdb,migue/voltdb,simonzhangsm/voltdb,kumarrus/voltdb,zuowang/voltdb,deerwalk/voltdb,VoltDB/voltdb,migue/voltdb,ingted/voltdb,flybird119/voltdb,migue/voltdb,wolffcm/voltdb,wolffcm/voltdb,wolffcm/voltdb,ingted/voltdb,simonzhangsm/voltdb,deerwalk/voltdb,migue/voltdb,wolffcm/voltdb,migue/voltdb,flybird119/voltdb,wolffcm/voltdb,ingted/voltdb,creative-quant/voltdb,deerwalk/voltdb,paulmartel/voltdb,deerwalk/voltdb,creative-quant/voltdb,simonzhangsm/voltdb,VoltDB/voltdb,zuowang/voltdb,creative-quant/voltdb,paulmartel/voltdb,paulmartel/voltdb,VoltDB/voltdb,VoltDB/voltdb,deerwalk/voltdb,migue/voltdb,migue/voltdb,zuowang/voltdb,flybird119/voltdb,zuowang/voltdb,kumarrus/voltdb,deerwalk/voltdb,creative-quant/voltdb,flybird119/voltdb,VoltDB/voltdb,simonzhangsm/voltdb,simonzhangsm/voltdb,paulmartel/voltdb,zuowang/voltdb,paulmartel/voltdb,kumarrus/voltdb,deerwalk/voltdb,paulmartel/voltdb,ingted/voltdb,simonzhangsm/voltdb,kumarrus/voltdb,kumarrus/voltdb,zuowang/voltdb,simonzhangsm/voltdb,VoltDB/voltdb,deerwalk/voltdb,wolffcm/voltdb,ingted/voltdb,wolffcm/voltdb,creative-quant/voltdb,flybird119/voltdb,flybird119/voltdb,kumarrus/voltdb,VoltDB/voltdb,creative-quant/voltdb,migue/voltdb,creative-quant/voltdb,paulmartel/voltdb,zuowang/voltdb,paulmartel/voltdb,kumarrus/voltdb,zuowang/voltdb,creative-quant/voltdb,flybird119/voltdb,ingted/voltdb,flybird119/voltdb,ingted/voltdb,wolffcm/voltdb