Fix RD_SERVER flag

Fix RD_SERVER flag

Small fix for the build with RD_SERVER flag.

Change-Id: I96eb60e05202635f595c3d1edc82aa634908c95b
Signed-off-by: Habib Virji <habib.virji@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/12903
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Uze Choi <uzchoi@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/15705
Reviewed-by: Phil Coval <philippe.coval@osg.samsung.com>
Reviewed-by: Todd Malsbary <todd.malsbary@intel.com>
Reviewed-by: Ziran Sun <ziran.sun@samsung.com>