virtio: decrement vq->inuse in virtqueue_discard()
virtqueue_discard() moves vq->last_avail_idx back so the element can be popped again. It's necessary to decrement vq->inuse to avoid "leaking" the element count. Cc: qemu-stable@nongnu.org Signed-off-by:Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by:
Michael S. Tsirkin <mst@redhat.com> Reviewed-by:
Cornelia Huck <cornelia.huck@de.ibm.com> Reviewed-by:
Michael S. Tsirkin <mst@redhat.com> Signed-off-by:
Michael S. Tsirkin <mst@redhat.com>
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