Ryan Libby 64e0efab39 db show thread: avoid overflow in tick conversion
The previous calculations for displaying the time since last switch
easily overflowed, after less than 36 min for hz=1000.  Now overflow
takes 2000 times longer (as long as ticks takes to wrap).

Reviewed by:	cem, markj
Sponsored by:	Dell EMC Isilon
Differential revision:	https://reviews.freebsd.org/D20273
2019-05-16 05:29:54 +00:00
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