if_em int_throttle_ceil patch

[Shunsuke SHINOMIYA]

 Hi, Jeremie and Lists.

  The previous patch to change if_em's int_throttle_ceil into
 sysctl-able cause a kernel panic. If you set em's int_throttle_ceil=0
 and then reconfigure the em, it cause a diveded by zero panic.

 This patch for original if_em.[ch] which is attached to this mail is
corrected this problem.

-- 
Shunsuke SHINOMIYA <shino at fornext.org>
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