storage: Refactor virStorageBackendSCSINewLun
storage: Refactor virStorageBackendSCSINewLun

Invert the logical of retval and clean up code paths, especially goto's

Signed-off-by: John Ferlan <87558058f6f829e5ec976c8ef960720af4ff9c7d@redhat.com>

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