block-migration: handle errors with the return codes correctly
Signed-off-by: NJuan Quintela <quintela@redhat.com> Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>
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Signed-off-by: NJuan Quintela <quintela@redhat.com> Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>