thumbnail: Fix a code path where the mutex is never unlocked
Fix one unusual code path where the GnomeDesktopThumbnailFactory’s mutex is not unlocked before the function returns. As well as the usual deadlock issues, this would lead to an abort on shutdown with recent GLib changes, as g_mutex_clear() would be called on the locked mutex, which GLib now (correctly) complains about. https://bugzilla.gnome.org/show_bug.cgi?id=740666
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3019eb8c
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