add LUX sensor tsl2561 support in lightd

guowenxue

2021-01-23 88f6121fabaa6b7b17a2d78a52ebef2ddda16104

 apue/2.Socket/ds18b20.c

@@ -98,5 +98,7 @@
    /* convert string value to float value */
    *temp = atof(ptr)/1000;
   
    close(fd);

    return 0;
}