bad printf

[Hal Murray]

> ../../ntpd/ntp_loopfilter.c:1005:20: warning: format '%lu' expects argument=
>  of type 'long unsigned int', but argument 2 has type 'uptime_t {aka unsign=
> ed int}' [-Wformat=3D]
>          DPRINT(2, ("local_clock: mu %lu state %d poll %d count %d\n", 

My bad.  I'll fix.

But first I have to figure out why it slipped through my testing.  I thought 
I covered that case.

-- 
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