remove minor warnings 


git-svn-id: svn://scm.gforge.inria.fr/svnroot/sofa/trunk@11132 b7f1a160-662a-0410-a6d8-bea165342f16
FIX : compilation 


git-svn-id: svn://scm.gforge.inria.fr/svnroot/sofa/trunk@11133 b7f1a160-662a-0410-a6d8-bea165342f16