error: incompatible integer to pointer conversion assigning to 'char *' from 'int'

```
/usr/ports/net/wdt/work/wdt-1.27.1612021-190-g6a122f2/ErrorCodes.cpp:37:9: error: incompatible integer to pointer conversion assigning to 'char *' from 'int'
  res = strerror_r(errnum, buf, sizeof(buf));
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
12 warnings and 1 error generated.
```