fixed c-code warnings

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/eventhistory@203 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
corrected typo

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/eventhistory@204 edb9625f-4e0d-4859-8d74-9fd3b1da38cb