[Libguestfs] [PATCH nbdkit v5 FINAL 01/19] server: Implement extents/can_extents calls for plugins and filters.

[Richard W.M. Jones]

I pushed this one which checks for API violations in all cases at the
small cost of storing an extra int64_t in the struct:

https://github.com/libguestfs/nbdkit/commit/24ba2105bee4e884ea88fffc9d42b17e894dd349

Rich.

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