Fix copy-pasto in error message.
Fix copy-pasto in error message.

Introduced by commit 522c7c09e5, spotted by Coverity.

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