iicbus ivars and BUS_ADD_CHILD

Hi everyone,

I've been looking over the 7.0 iicbus code, and I see that the iicbus
driver now uses an ivar to store the address for each child device
(cool!).  The ivar is malloc'ed in the iicbus implementation of
BUS_ADD_CHILD, but it doesn't ever appear to be freed.  And bus_if.m
doesn't appear to contain a reciprocal for BUS_ADD_CHILD (e.g.
BUS_DELETE_CHILD) that would take care of bus-specific cleanup.  Are
ivars just leaked right now when device_delete_child() is called on
the child device, or is the caller of device_delete_child() expected
to free them?

Thanks,
Jason
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