libcmis: WaE: warning C4101: 'e' : unreferenced local variable

Change-Id: I37456029e766340450988f3d6c768bf2fd7aa973
Reviewed-on: https://gerrit.libreoffice.org/9313
Tested-by: LibreOffice gerrit bot <gerrit@libreoffice.org>
Reviewed-by: Thomas Arnhold <thomas@arnhold.org>
Tested-by: Thomas Arnhold <thomas@arnhold.org>