Remove unnecessary NULL checks.
Remove unnecessary NULL checks.

As Coverity pointed out, 'pelem' has already been dereferenced in the
function, and hence it can never be NULL here. And indeed it should never
be NULL.

With 'prule', we explicitly checked for NULL earlier in the function.

lisakowen/gpdb,Chibin/gpdb,ashwinstar/gpdb,jmcatamney/gpdb,lisakowen/gpdb,ashwinstar/gpdb,ashwinstar/gpdb,xinzweb/gpdb,xinzweb/gpdb,jmcatamney/gpdb,xinzweb/gpdb,ashwinstar/gpdb,ashwinstar/gpdb,50wu/gpdb,greenplum-db/gpdb,greenplum-db/gpdb,jmcatamney/gpdb,ashwinstar/gpdb,50wu/gpdb,lisakowen/gpdb,xinzweb/gpdb,50wu/gpdb,adam8157/gpdb,greenplum-db/gpdb,adam8157/gpdb,Chibin/gpdb,Chibin/gpdb,Chibin/gpdb,50wu/gpdb,50wu/gpdb,Chibin/gpdb,jmcatamney/gpdb,xinzweb/gpdb,greenplum-db/gpdb,50wu/gpdb,Chibin/gpdb,xinzweb/gpdb,ashwinstar/gpdb,adam8157/gpdb,xinzweb/gpdb,50wu/gpdb,jmcatamney/gpdb,adam8157/gpdb,Chibin/gpdb,greenplum-db/gpdb,lisakowen/gpdb,Chibin/gpdb,ashwinstar/gpdb,jmcatamney/gpdb,adam8157/gpdb,lisakowen/gpdb,jmcatamney/gpdb,adam8157/gpdb,greenplum-db/gpdb,lisakowen/gpdb,50wu/gpdb,jmcatamney/gpdb,xinzweb/gpdb,Chibin/gpdb,greenplum-db/gpdb,Chibin/gpdb,lisakowen/gpdb,greenplum-db/gpdb,adam8157/gpdb,adam8157/gpdb,lisakowen/gpdb