Fix defects detected by static analysis

Fix defects detected by static analysis

Change-Id: Iee6f843db1602d0a6fcc0bd43841d306d4a7257c
Signed-off-by: Parkhi <h_w.park@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/15331
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: JungYong KIM <jyong2.kim@samsung.com>
Reviewed-by: Senthil Kumar G S <senthil.gs@samsung.com>
Reviewed-by: Jihun Ha <jihun.ha@samsung.com>
Reviewed-by: Uze Choi <uzchoi@samsung.com>
(cherry picked from commit f36c71f082f9e5eca0249a30d3f8104f726d27b1)
Reviewed-on: https://gerrit.iotivity.org/gerrit/15557