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   ping(8): don't round inter-packet delay up to HZ

   ping(8) doesn't know the value of HZ and shouldn't round the user's
   packet wait up to whatever it thinks HZ is.  If the period is too small
   the interrupt will simply fire less often than instructed.  The kernel
   will do the right thing regardless.

   Given the rarity of this usage we don't really need to print a warning,
   either.

   ok millert@

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