fdstream: separate out virCommandPtr cleanup
fdstream: separate out virCommandPtr cleanup

Let's us de-nest some of the logic, and will simplify upcoming
patches

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