text-freetype2: Fix bug 0000151

Fix bug 0000151: File loading not properly handled.

Link to bug: https://obsproject.com/mantis/view.php?id=151

A newly selected font is not loaded properly if "read from file" is
active without a valid file.  Old error handling lead to random memory
being displayed.

Closes Pull Request #390

(message edited by Jim)
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