[Bug 198139] timer2sbintime() Loss of precision during conversion

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=198139

            Bug ID: 198139
           Summary: timer2sbintime() Loss of precision during conversion
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: gibbs at FreeBSD.org

The conversion error in timer2sbintime() is very high, almost 7% for timers
using NOTE_NSECONDS.  A nanosecond takes 4.294967296 "sbintimes", but the
conversion truncates this to 4 through its multiplication by the constant
SBT_1NS.  Similar, but much smaller, error is introduced for the NOTE_USECONDS
and NOTE_MSECONDS conversions.

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