Adding NULL checking input parameter in SRMRequestHandler

Adding NULL checking input parameter in SRMRequestHandler

Patch 1: upload patch

Change-Id: I869fd8d2d3198033be3cb36fe4fa1e7f602ba823
Signed-off-by: js126.lee <js126.lee@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/16299
Reviewed-by: Joonghwan Lee <jh05.lee@samsung.com>
Reviewed-by: dongik Lee <dongik.lee@samsung.com>
Reviewed-by: Chul Lee <chuls.lee@samsung.com>
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Randeep Singh <randeep.s@samsung.com>
(cherry picked from commit 4728815858d3a7e4f990dd99cf888f8d4a00f921)
Reviewed-on: https://gerrit.iotivity.org/gerrit/16301