fix transfer devices


git-svn-id: https://forge.indepnet.net/svn/glpi/trunk@21238 35612d4c-9d10-0410-837c-bf9dd1be60d7
clean code


git-svn-id: https://forge.indepnet.net/svn/glpi/trunk@21240 35612d4c-9d10-0410-837c-bf9dd1be60d7