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

guowenxue

2019-08-03 1ba740d4f23b97f105bbc3dd9780904f422a766c

 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;
}