libxl: don't unlock virDomainObj if refcnt is 0
libxl: don't unlock virDomainObj if refcnt is 0

Commit 6472e54a unlocks the virDomainObj even if libxlDomainObjEndJob
returns false, indicating that its refcnt has dropped to 0.

Signed-off-by: Jim Fehlig <39929b5b86d72d51fceac59b52303e3fe8a3083e@suse.com>

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