virtio: allow mapping up to max queue size
It's a loop from i < num_sg and the array is VIRTQUEUE_MAX_SIZE - so it's OK if the value read is VIRTQUEUE_MAX_SIZE. Not a big problem in practice as people don't use such big queues, but it's inelegant. Reported-by: N"Dr. David Alan Gilbert" <dgilbert@redhat.com> Cc: qemu-stable@nongnu.org Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
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