block: handle ENOTSUP from discard in generic code
Similar to write_zeroes, let the generic code receive a ENOTSUP for discard operations. Since bdrv_discard has advisory semantics, we can just swallow the error. Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com> Reviewed-by: NPeter Lieven <pl@kamp.de> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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