The code has gone through many refactors, but the first refactor was the one
which broke it by inverting the check with respect to checkpointed streams.
Fixes: 7449fb36c6c8 ("migration/save: pass checkpointed_stream from libxl to libxc") Reported-by: Olaf Hering <olaf@aepfle.de> Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> Acked-by: Olaf Hering <olaf@aepfle.de> Reviewed-by: Jan Beulich <jbeulich@suse.com>