pci_sriov_set_totalvfs again

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Calling pci_sriov_set_totalvfs(dev, 0) has no effect, because
pci_sriov_get_totalvfs ignores dev->sriov->driver_max_VFs if it's 0, as
that is used as the 'not set' value.
So, three questions:
a) is this a bug?
b) if not, should the comment on pci_sriov_set_totalvfs mention that
passing numvfs=0 will be interpreted as numvfs=dev->sriov->total_VFs?
c) is there a better way of indicating "current configuration doesn't
support VFs" rather than calling set_totalvfs(0)?

Thanks,
-Edward
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