call for bge(4) testers

Hi,

After fixing em(4) watchdog bug, I looked over bge(4) and I think
bge(4) may suffer from the same issue. So if you have seen occasional
watchdog timeout errors on bge(4) please give the attached patch a try.
The patch does fix false watchdog timeout error only.
Typical pheonoma for false watchdog timeout error are
       o polling(4) fix the issue
       o random watchdog error

If my patch fix the issue you could see the following messages.
"missing Tx completion interrupt!" or "link lost -- resetting"

Thanks.
-- 
Regards,
Pyun YongHyeon