Close PQExpBuffers before ending scope
Close PQExpBuffers before ending scope

Ensure that we close all PQExpBuffers before closing scope. Spotted
by Coverity

lintzc/gpdb,rvs/gpdb,greenplum-db/gpdb,cjcjameson/gpdb,Quikling/gpdb,Quikling/gpdb,jmcatamney/gpdb,Chibin/gpdb,Chibin/gpdb,adam8157/gpdb,Chibin/gpdb,lisakowen/gpdb,lintzc/gpdb,greenplum-db/gpdb,edespino/gpdb,rvs/gpdb,kaknikhil/gpdb,Chibin/gpdb,jmcatamney/gpdb,ashwinstar/gpdb,Quikling/gpdb,edespino/gpdb,xinzweb/gpdb,adam8157/gpdb,kaknikhil/gpdb,adam8157/gpdb,Quikling/gpdb,edespino/gpdb,rvs/gpdb,lisakowen/gpdb,xinzweb/gpdb,greenplum-db/gpdb,cjcjameson/gpdb,ashwinstar/gpdb,Quikling/gpdb,rvs/gpdb,xinzweb/gpdb,lisakowen/gpdb,edespino/gpdb,cjcjameson/gpdb,cjcjameson/gpdb,jmcatamney/gpdb,greenplum-db/gpdb,Quikling/gpdb,Chibin/gpdb,yuanzhao/gpdb,lisakowen/gpdb,yuanzhao/gpdb,jmcatamney/gpdb,50wu/gpdb,Quikling/gpdb,rvs/gpdb,jmcatamney/gpdb,edespino/gpdb,Chibin/gpdb,lintzc/gpdb,edespino/gpdb,50wu/gpdb,jmcatamney/gpdb,adam8157/gpdb,lisakowen/gpdb,janebeckman/gpdb,edespino/gpdb,ashwinstar/gpdb,rvs/gpdb,adam8157/gpdb,janebeckman/gpdb,rvs/gpdb,Chibin/gpdb,rvs/gpdb,rvs/gpdb,xinzweb/gpdb,cjcjameson/gpdb,yuanzhao/gpdb,kaknikhil/gpdb,kaknikhil/gpdb,ashwinstar/gpdb,cjcjameson/gpdb,50wu/gpdb,janebeckman/gpdb,lintzc/gpdb,greenplum-db/gpdb,janebeckman/gpdb,adam8157/gpdb,kaknikhil/gpdb,xinzweb/gpdb,kaknikhil/gpdb,lisakowen/gpdb,50wu/gpdb,greenplum-db/gpdb,lintzc/gpdb,edespino/gpdb,jmcatamney/gpdb,ashwinstar/gpdb,greenplum-db/gpdb,edespino/gpdb,adam8157/gpdb,Chibin/gpdb,lisakowen/gpdb,cjcjameson/gpdb,Chibin/gpdb,ashwinstar/gpdb,kaknikhil/gpdb,adam8157/gpdb,Quikling/gpdb,edespino/gpdb,lintzc/gpdb,yuanzhao/gpdb,cjcjameson/gpdb,cjcjameson/gpdb,rvs/gpdb,50wu/gpdb,lintzc/gpdb,yuanzhao/gpdb,jmcatamney/gpdb,Quikling/gpdb,cjcjameson/gpdb,janebeckman/gpdb,janebeckman/gpdb,yuanzhao/gpdb,lintzc/gpdb,yuanzhao/gpdb,kaknikhil/gpdb,janebeckman/gpdb,Chibin/gpdb,greenplum-db/gpdb,50wu/gpdb,lisakowen/gpdb,janebeckman/gpdb,50wu/gpdb,janebeckman/gpdb,yuanzhao/gpdb,ashwinstar/gpdb,50wu/gpdb,xinzweb/gpdb,yuanzhao/gpdb,kaknikhil/gpdb,xinzweb/gpdb,xinzweb/gpdb,janebeckman/gpdb,ashwinstar/gpdb,kaknikhil/gpdb,yuanzhao/gpdb,Quikling/gpdb,lintzc/gpdb