K 10 svn:author V 3 mav K 8 svn:date V 27 2010-10-31T11:44:41.818468Z K 7 svn:log V 215 Fix callout_tickstofirst() behavior after signed integer ticks overflow. This should fix callout precision drop to 1/4s after 25 days of uptime with HZ = 1000. Submitted by: Taku YAMAMOTO END