[PATCH 2 of 3 stable] tests: correct (I think) command in test-largefiles-update

[Augie Fackler]

> On Jan 31, 2017, at 19:50, Mads Kiilerich <mads at kiilerich.com> wrote:
> 
> IIRC, some of the random failures I have seen wasn't in --check failing the check. Instead, later operations showed that this --check silently had failed to detect changes. Turning it into --clean would thus not make any difference - it would not find any changes to clean away.
> 
> That is why my patch also removed the largefile and standin so I was sure --clean would restore the state of the file.
> 
> Things might have changed since then, and this --clean might now be enough to make it stable. If not, this might be why.
> 
> I like that your next patch adds a FIXME ... but of course not that it also re-introduce the instability.

Yeah. Maybe I should file a bug for now?