tail huge-file >/dev/full panics with unwrap()

```
$ truncate -s 1GB /tmp/huge
$ tail /tmp/huge > /dev/full

thread 'main' (3191) panicked at src/uu/tail/src/tail.rs:594:37:
called `Result::unwrap()` on an `Err` value: Os { code: 28, kind: StorageFull, message: "No space left on device" }
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
```