virtio_balloon: use simplified virtqueue accessors.
We never add buffers with input and output parts, so use the new accessors.
Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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We never add buffers with input and output parts, so use the new accessors.
Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>