Fix a typo

git-svn-id: svn://svn.code.sf.net/p/rdkit/code/trunk@2430 a5045d30-4826-4484-9c7f-6e55a06ddc77
fix GitHub issue 8
This breaks the InChI python unit tests, so those need to be cleaned up.

git-svn-id: svn://svn.code.sf.net/p/rdkit/code/trunk@2431 a5045d30-4826-4484-9c7f-6e55a06ddc77