update mqttd main.c, fix debug with java bug for JSON with \0 bug

guowenxue

2019-08-03 2f6051f61e62ac477622f02708cb8eb13bc0ca51

 modules/c/ds18b20.c

@@ -32,7 +32,7 @@
                return 1;
        }

        printf("DS19B20 get temperature: %f ℃\n", temp);
        printf("DS18B20 get temperature: %f ℃\n", temp);
        return 0;
}