BugID:17738427:[system] fix return type err issue
@@ -380,7 +380,7 @@ static char *guider_set_auth_req_str(char sign[], char ts[])
rc = iotx_device_info_get(&dev);
if(rc < 0) {
sys_err("get device info err");
- return rc;
+ return NULL;
}
ret = LITE_malloc(AUTH_STRING_MAXLEN);
