Adrian Chadd 15b1492c9b Don't call enable_all_rings if the adapter has been freed.
This is a subtle use-after-free race that results in some very undesirable
hang behaviour.

Reviewed by:	pkelsey
Obtained from:	Kip Macy, NextBSD (91a9bd1dbb)
2015-09-07 23:16:39 +00:00
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