xen/clock.c:get_tsc_offset_ns

[Jed Davis <jdev%panix.com@localhost>]

I notice that the static function get_tsc_offset_ns in xen/clock.c
multiplies a uint32_t by 1000000000, which looks to me as though it'll
pretty much always overflow (if more than 4 cycles have passed since
the last call to get_time_values_from_xen, it seems).  So, two questions:

1) Should that be 1000000000ULL instead? 
2) If so, how much is this breaking?

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