Uptime starts with one second

[Poul-Henning Kamp]

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As I recall (author of timecounters here...) the ARP code was the
reason we had to start uptime at one.  Can't remember what it did
if uptime was zero, but probably some variant of "not working".

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.