error: invalid use of void expression

```
/usr/ports/cad/graywolf/work/graywolf-0.1.6-3-g6c5e24f/src/genrows/draw.c:1212:20: error: invalid use of void expression
 1212 |  if (last_chanceG) (VOID)last_chance() ;
      |                    ^
```

gcc-9 on FreeBSD 12