[Libguestfs] [libnbd PATCH] interop: Tolerate qemu-nbd 6.0 change in behavior

[Richard W.M. Jones]

I tested this with:

 - upstream qemu
 - upstream qemu with Nir's patch reverted
 - qemu 5.2

and it worked in all of those cases.

Pushed it now, thanks.

Rich.

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