[issue1733] patch: update iwi(4)

["Alex Hornung \(via DragonFly issue tracker\)" <sinknull@xxxxxxxxxxxxxxxxxxxxx>]

Alex Hornung <ahornung@gmail.com> added the comment:

fwiw, for such a basic use of alloc_unr, devfs_clone_bitmap functions will work 
fine (see man devfs_clone_bitmap_get). Just note that they always start the 
numbering at 0, so you might need to set a few as allocated if you don't want 
them. An upper limit is provided.

Cheers,
Alex Hornung

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