qemu: Remove character device backend only after frontend is gone
qemu: Remove character device backend only after frontend is gone

In general, we should only remove a backend after seeing DEVICE_DELETED
event for a corresponding frontend.

Signed-off-by: Jiri Denemark <62bdf77dc47919a4d59a91822129d14633cfca81@redhat.com>

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