[patch 0/2] pci_register_device can fail

[Chris Wright <chrisw@sous-sol.org>]

The pci hotadd patches make it easy to trigger segfaults when adding more
devices than a single PCI bus can handle.  The following 2 patches fix the
pci nic devices and virtio-blk device.  Now the following the following:

  OK bus 0, slot 31, function 0 (devfn 248)
  (qemu) pci_add 0 nic model=virtio
  Segmentation fault

  OK bus 0, slot 31, function 0 (devfn 248)
  (qemu) pci_add 0 storage file=/mnt/disk1,if=virtio
  Segmentation fault

become:

  OK bus 0, slot 31, function 0 (devfn 248)
  (qemu) pci_add 0 nic model=virtio
  qemu: Unable to initialze NIC: virtio
  failed to add model=virtio

  OK bus 0, slot 31, function 0 (devfn 248)
  (qemu) pci_add 0 storage file=/mnt/disk1,if=virtio
  failed to add file=/mnt/disk1,if=virtio

thanks,
-chris
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