Fix error when trying to run --remove-all

When running `hose --remove-all`, an error was being encountered.

I'm not familiar with node or your hose codebase, but I believe the code change I made should fix the issue.

The error was as follows:

```
sudo hose --remove-all

/usr/local/share/npm/lib/node_modules/hose/index.js:32
        if (!err) {
             ^
ReferenceError: err is not defined
    at /usr/local/share/npm/lib/node_modules/hose/index.js:32:14
    at Object.oncomplete (fs.js:107:15)
```

P.S. `hose` is intriguing! Nice work so far. I might play with `hose` and see if I can get it working with [dnsmasq](http://serverfault.com/questions/118378/in-my-etc-hosts-file-on-linux-osx-how-do-i-do-a-wildcard-subdomain) so that domains can be wildcarded.