can validate a change

git-svn-id: https://forge.indepnet.net/svn/glpi/trunk@23201 35612d4c-9d10-0410-837c-bf9dd1be60d7
clean code

git-svn-id: https://forge.indepnet.net/svn/glpi/trunk@23202 35612d4c-9d10-0410-837c-bf9dd1be60d7