qemu: blockcopy: Don't remove existing disk mirror info
qemu: blockcopy: Don't remove existing disk mirror info

When creating a new disk mirror the new struct is stored in a separate
variable until everything went well. The removed hunk would actually
remove existing mirror information for example when the api would be run
if a mirror still exists.

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