oc_dtls: misc. fixes
oc_dtls: misc. fixes

Change-Id: I013fdd48baa300ab0a744a1571c7e4c43d9ac617
Signed-off-by: Kishen Maloor <c62ddea3cd661a9268bff15f07fc2229cdc9ac02@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/19503

iotivity/iotivity-constrained,iotivity/iotivity-constrained,iotivity/iotivity-constrained,iotivity/iotivity-constrained