virtio: console: Barrier needed before dropping early_put_chars?

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Hey Rusty, Christian,

Christoph Hellwig asked why we don't need a barrier before this code in
virtcons_probe():

> +     /* Start using the new console output. */
> +     early_put_chars = NULL;
>       return 0;

Since only s390 uses early_put_chars so far, you'd know why it's not
needed / why we're safe.

Thanks,
		Amit
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