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virtio-scsi in Windows guests cause QEMU to abort/crash
Description of problem:
* Attempting to load the virtio-scsi drivers in a Windows guest causes the VM to abort/crash.
Steps to reproduce:
* `qemu-system-x86_64 -accel kvm -m 4G -device virtio-scsi-pci,id=scsi0 -drive media=cdrom,file=windows7-x64.iso -drive media=cdrom,file=virtio-win-0.1.173.iso`
* Boot the installer ISO, click through all the menus to eventually get to Custom Install
* In "Where do you want to install" click Load driver
* Browse E: drive and pick the first amd64/w7 folder
* Should show "Red Had VirtIO SCSI pass-through controller"
* Click Next
* Abort/crash
Same thing happens with VM's that used to work already running the virtio-scsi drivers. When they boot the VM aborts.
Additional information:
```
qemu-system-x86_64: ../accel/kvm/kvm-all.c:1760: kvm_irqchip_commit_routes: Assertion `ret == 0' failed.
Aborted (core dumped)
```
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