While runing one of my tutorial macros I crashed RooFit on a very 
unfortunate typo that I introduced while fixing one of the -Wshadow 
warning messages that was not exposed in any of the other use cases
that I run in stressRooFit.


git-svn-id: http://root.cern.ch/svn/root/trunk@24513 27541ba8-7e3a-0410-8455-c3a389f83636