kern/84954: [CARDBUS] cbb alloc res fail (with hw.cardbus.debug=1 output)

[M. Warner Losh]

Actually, these aren't related to my recent changes.

The problem is that netchild has a laptop without a pci bridge (well,
with cbb on bus 0).  This means we use a fairly lame default address.
In these cases, one has to manually set a better one.  Set
hw.cardbus.start_address to something else.  Figure that out by trial
and error.

Warner