qemuIsMultiFunctionDevice: return early for non-PCI addresses
qemuIsMultiFunctionDevice: return early for non-PCI addresses

There is no point in iterating over all devices if none of them
could possibly match.

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