[LTP] [PATCH] API: Give user hint when checkpoints were not initialised

[Petr Vorel]

Hi Richie,

> Currently the user gets an error about EOVERFLOW. This will hopefully
> save some searching.

Nice! I'm for merging it before release (with that fixed whitespace).

Acked-by: Petr Vorel <pvorel@suse.cz>

Kind regards,
Petr