migration: wire vmstate_save_state errors up to vmstate_subsection_save
Route the errors from vmstate_save_state up through vmstate_subsection_save (and back down, all rather recursive). Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com> Message-Id: <20170925112917.21340-5-dgilbert@redhat.com> Reviewed-by: NPeter Xu <peterx@redhat.com> Reviewed-by: NCornelia Huck <cohuck@redhat.com> Reviewed-by: NJuan Quintela <quintela@redhat.com> Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com> Commit message fixed up as per Peter's review
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