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The output queue is independent of the other wiimote modules and can run
on its own. Therefore, move its members into a separate struct so we don't
run into name collisions with other modules.

This is only a syntactic change that renames all queue members to queue.*.
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>