Fix one compilation warning.
Fix one compilation warning.

git-svn-id: a49aa41e49c69a6ab6ef43f172843a2fef6cb475@964 7c7d615a-03b3-410d-a316-1135b1bd9499

centreon/centreon-broker,centreon/centreon-broker,centreon/centreon-broker,centreon/centreon-broker,centreon/centreon-broker