ebc4b52369
When hz > 1000, msec / (1000 / hz) results in division by zero. I found somewhere in FreeBSD using howmany(msec * hz, 1000) to convert ms to ticks, avoiding the potential for a zero in the divisor. Reviewed-by: Alexander Motin <mav@FreeBSD.org> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ryan Moeller <freqlabs@FreeBSD.org> Closes #10894