Set the tempfile to NULL when deleting it.
Set the tempfile to NULL when deleting it.

This makes sure we don't double-delete it in the destructor.

git-svn-id: 83c4c97093aeea62ac982fbfd516bf9db27f5c99@851 c36c8488-0289-0348-9b64-b301f74bd9a7

BlueBrain/Tuvok,BlueBrain/Tuvok,BlueBrain/Tuvok