> Module Name:    src
> Committed By:   jdolecek
> Date:           Fri Apr 10 18:03:06 UTC 2020
> Modified Files:
>         src/sys/arch/xen/xen: if_xennet_xenbus.c
> Log Message:
> convert to bus_dma(9), remove now not necessary XENPVHVM redefines
> [...]
> +               KASSERT(req->rxreq_gntref = GRANT_INVALID_REF);

I don't think this does quite what you meant it to do!

I can fix it by adding the missing `=', but it may cause the kassert
to fire because I don't see anywhere in xennet_rx_free_req that sets
it to GRANT_INVALID_REF and I don't know the surrounding logic well
enough to be confident that just changing it there is correct.

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