qemuDomainAttachChrDevice: Fix chardev hotplug
qemuDomainAttachChrDevice: Fix chardev hotplug

Not every chardev is plugged onto virtio-serial bus. However, the
code introduced in 89e991a2aa36b04 assumes that. Incorrectly.
With previous patches we have three options where a chardev can
be plugged: virtio-serial, USB and PCI. This commit fixes the
attach part.  However, since we are not auto allocating USB
addresses yet, I'm just marking the place where appropriate code
should go.

Signed-off-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>

fabianfreyer/libvirt,olafhering/libvirt,taget/libvirt,VenkatDatta/libvirt,nertpinx/libvirt,eskultety/libvirt,taget/libvirt,libvirt/libvirt,crobinso/libvirt,nertpinx/libvirt,agx/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,andreabolognani/libvirt,libvirt/libvirt,crobinso/libvirt,datto/libvirt,jardasgit/libvirt,taget/libvirt,olafhering/libvirt,eskultety/libvirt,andreabolognani/libvirt,andreabolognani/libvirt,crobinso/libvirt,agx/libvirt,agx/libvirt,libvirt/libvirt,jfehlig/libvirt,olafhering/libvirt,VenkatDatta/libvirt,eskultety/libvirt,jardasgit/libvirt,agx/libvirt,jfehlig/libvirt,zippy2/libvirt,rlaager/libvirt,datto/libvirt,zippy2/libvirt,rlaager/libvirt,eskultety/libvirt,agx/libvirt,zippy2/libvirt,nertpinx/libvirt,VenkatDatta/libvirt,olafhering/libvirt,fabianfreyer/libvirt,datto/libvirt,rlaager/libvirt,datto/libvirt,taget/libvirt,libvirt/libvirt,VenkatDatta/libvirt,fabianfreyer/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,datto/libvirt,nertpinx/libvirt,andreabolognani/libvirt,VenkatDatta/libvirt,jardasgit/libvirt,andreabolognani/libvirt,crobinso/libvirt,zippy2/libvirt,jfehlig/libvirt,rlaager/libvirt,eskultety/libvirt,nertpinx/libvirt,taget/libvirt,rlaager/libvirt,jfehlig/libvirt