Sanity check the BAR length reported by the CIS with the BAR length that is encoded in the PCI BAR.  The latter is more reliable.
Sanity check the BAR length reported by the CIS with the BAR length that
is encoded in the PCI BAR.  The latter is more reliable.

This allows the sio/modem function of the Xircom RealPort ethernet+modem
card to work.  Note that there still seem to be issues with sio_pci not
releasing resources on detach.

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