makeTest utility does not handle done() errors

[vweevers]

My guess is, done wasn't meant to be used like an error-first callback, but it is. For example:

leveldown/test/iterator-test.js

Line 125 in 1fd0bdb

ite.end(done)

The current signature of done is:

leveldown/test/make.js

Lines 7 to 16 in 1fd0bdb

	var done = function (close) {
	if (close === false) {
	t.end()
	return
	}
	db.close(function (err) {
	t.error(err, 'no error from close()')
	t.end()
	})
	}