Kazuhiro NISHIYAMA 5be75aad37
Add FALLTHROUGH
Pointed out by Coverity Scan

```
** CID 1466646: Control flow issues (MISSING_BREAK)
/ext/-test-/random/loop.c: 63 in loop_get_bytes()
```
2020-09-08 10:30:07 +09:00
..
2020-09-08 10:30:07 +09:00