null out the iterative variable in loops when we are done;  this may cause interesting fallout but at least segfaults are easier to detect and fix than operating blindly on the last list element
null out the iterative variable in loops when we are done;  this may cause interesting fallout but at least segfaults are easier to detect and fix than operating blindly on the last list element

git-svn-id: f2acecaac6fbd5a03f3d4799db58dda434111981@2921 3eda493b-6a19-0410-b2e0-ec8ea4dd8fda

pscedu/slash2-stable,pscedu/pfl,pscedu/pfl,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/pfl,pscedu/slash2-stable,pscedu/pfl,pscedu/slash2-stable,pscedu/slash2-stable