RRD: fix type of value provided in rrd_update_r(). This fixes #6075.
RRD: fix type of value provided in rrd_update_r(). This fixes #6075.

According to RRDtool sources, COUNTER accepts unsigned integer, DERIVE
accepts signed integer and both GAUGE and ABSOLUTE accepts floats.

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