Patrick Kelsey 9e9b738ac5 Fix iflib freelist state corruption
This fixes a bug in iflib freelist management that breaks the required
correspondence between freelist indexes and driver ring slots.

PR:		243126, 243392, 240628
Reported by:	avg, alexandr.oleynikov@gmail.com, Harald Schmalzbauer
Reviewed by:	avg, gallatin
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D23943
2020-03-14 19:43:44 +00:00
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