block: add default get_block_status implementation for protocols
Protocols return raw data, so you can assume the offsets to pass through unchanged. Reviewed-by: NEric Blake <eblake@redhat.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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