Ariff Abdullah 05cba74005 Protect against divide by zero while calculating bus speed due to
possible broken kernel timecounter.

Reported/Tested by:	silby
Approved by:		re (hrs)
MFC after:		1 day
2007-07-11 14:27:45 +00:00
..
2007-06-20 05:11:37 +00:00