Remove self-assignment of struct member
Remove self-assignment of struct member

This seems to be a left-over mis-merge from the 8.3 merge where
before we set up a SubExecutorState during processing the range
table, the line used to read:

   estate->es_sharenode = sp_estate->es_sharenode;

sp_estate is removed and the assignment is clearly not serving
any need so remove.

Per gripe from Coverity

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