qemu: remove pointless address validation on hot unplug
qemu: remove pointless address validation on hot unplug

Back in the times of using 'pci_del', unplugging a device without
a PCI address was not wired up.

After completely removing support for qemu without QEMU_CAPS_DEVICE,
aliases are used to uniquely identify devices in all cases.

Remove the pointless validation of data that was already present
in the domain definition.

jardasgit/libvirt,andreabolognani/libvirt,libvirt/libvirt,nertpinx/libvirt,jfehlig/libvirt,eskultety/libvirt,jfehlig/libvirt,crobinso/libvirt,crobinso/libvirt,libvirt/libvirt,nertpinx/libvirt,nertpinx/libvirt,jardasgit/libvirt,eskultety/libvirt,fabianfreyer/libvirt,zippy2/libvirt,zippy2/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,zippy2/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,eskultety/libvirt,andreabolognani/libvirt,olafhering/libvirt,libvirt/libvirt,olafhering/libvirt,libvirt/libvirt,jardasgit/libvirt,crobinso/libvirt,nertpinx/libvirt,olafhering/libvirt,eskultety/libvirt,andreabolognani/libvirt,olafhering/libvirt,nertpinx/libvirt,zippy2/libvirt,eskultety/libvirt,jfehlig/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,crobinso/libvirt,jfehlig/libvirt,andreabolognani/libvirt