I don't think the line quote above refers to Melkor's freedom. It merely calls Melkor the 'giver of freedom'.
Sauron would not have been able to open the door of night, even had he wished to do so. The Valar would have prevented him. Melkor is basically kept in the void by the wills of the Valar, and so while they are still vigilant he will not be able to escape.
-Voronwe
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"If you would be a real seeker after truth, you must at least once in your life doubt, as far as possible, all things." -- René Descartes
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