fix delete


git-svn-id: https://geuz.org/svn/gmsh/trunk@18301 59c8cabf-10d6-4a28-b43f-3936b85956c4
missing return value


git-svn-id: https://geuz.org/svn/gmsh/trunk@18302 59c8cabf-10d6-4a28-b43f-3936b85956c4