Variable `module` inside module breaks deamdify

Let's say I have two files

a.js

``` js
define(function () {
var module = {
t: function () {
console.log('a');
}
};
return module;
});
```

b.js

``` js
define(['./a'], function (a) {
a.t();
});
```

Then `browserify -t deamdify b.js -o bundle.js` yields

``` js
...

var module = {
t: function () {
console.log('a');
}
};
module.exports = module;

...
```

Importing that in node throws an error:

``` sh
$ node
> require('./bundle')
TypeError: Object # has no method 't'
at Object../a (/private/tmp/amd/bundle.js:10:3)
```

Reproduce the issue with the shown a.js and b.js files by running browserify -t deamdify b.js -o bundle.js and requiring the result in Node. Then inspect deamdify's AMD-to-CommonJS transform and verify that a local variable named module does not replace the exported module object, while a.t() still works.

Written by the indexing model from the issue text.