[patch] if_bxe shutdown fix

[Mike Silbersack]

Does anyone want to review this patch before I check it in?  The change 
has been reviewed and tested by coworkers, but not yet reviewed by any 
other FreeBSD committers.

http://www.silby.com/patches/if_bxe.c-safestop.patch

This resolves an issue we saw at work where IPMI would report bus errors 
when you rebooted a system with bxe NICs if you had not UP'd all of the 
bxe NICs before the shutdown.

Thanks,

Mike "Silby" Silbersack