Fix compilation issue in the security stack

Fix compilation issue in the security stack

- Some variable were left unused.
- ifdef was
- size_t being print with %d

Change-Id: I22524cd67a9cc4e1b8cd7844c2d81903b8084985
Signed-off-by: Habib Virji <habib.virji@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/12885
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Kevin Kane <kkane@microsoft.com>
Reviewed-by: Ashwini  Kumar <k.ashwini@samsung.com>
Reviewed-by: Randeep Singh <randeep.s@samsung.com>
(cherry picked from commit a875cebd84216a1f4e3320e67c432e0cb8914be2)
Reviewed-on: https://gerrit.iotivity.org/gerrit/12883