Portability fix in kern_ntptime.c

[Kamil Rytarowski <n54%gmx.com@localhost>]

Does this patch look good?

http://netbsd.org/~kamil/patch-00121-kern_ntptime.c.txt

It fixes the following reports:

[  49.1001191] UBSan: Undefined Behavior in
../../../../kern/kern_ntptime.c:381:14, left shift of negative value
-43172954112
[  49.1001191] UBSan: Undefined Behavior in
../../../../kern/kern_ntptime.c:381:14, left shift of negative value
-43172954112

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