conf: reduce indentation in virDomainDefAddImplicitVideo
conf: reduce indentation in virDomainDefAddImplicitVideo

Return early if there is nothing to do.

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