Previously, loop_device_make() would return the device fd in one success code path, but not the other (where' we'd just return 0). loop_device_open() returns it in all cases. Hence, let's clean this up, and make sure in all success code paths of both functions we return it (even though it strictly speaking is redundant, since we return it in LoopDevice anyway, and currently noone actually relies on this).
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