[IOT-2961] save doxm section

add json2cbor save doxm section

Change-Id: I2578ebd8162978b489833edc7e6159b30cb851ec
Signed-off-by: Oleksandr Dmytrenko <o.dmytrenko@samsung.com>
(cherry picked from commit 2a46516c)
Origin: https://gerrit.iotivity.org/gerrit/#/c/23903/

resource/csdk/security/tool/json2cbor.c

@@ -926,6 +926,9 @@ OicSecDoxm_t *JSONToDoxmBin(const char *jsonStr)
     jsonRoot = cJSON_Parse(jsonStr);
     VERIFY_NOT_NULL(TAG, jsonRoot, ERROR);
 
+    jsonDoxm = cJSON_GetObjectItem(jsonRoot, OIC_JSON_DOXM_NAME);
+    VERIFY_NOT_NULL(TAG, jsonDoxm, ERROR);
+
     //Oxm -- not Mandatory
     jsonObj = cJSON_GetObjectItem(jsonDoxm, OIC_JSON_OXMS_NAME);
     if (jsonObj && cJSON_Array == jsonObj->type)