vhost-user+postcopy: Use qemu_set_nonblock
Use qemu_set_nonblock rather than a simple fcntl; cleaner and I have no reason to change other flags. Reported-by: NPeter Maydell <peter.maydell@linaro.org> Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com> Reviewed-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
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