[Bug 192641] [iwn] panic in AMPDU tx code "ni: no node"

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=192641

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A commit references this bug:

Author: avos
Date: Wed Jan 16 12:33:07 UTC 2019
New revision: 343094
URL: https://svnweb.freebsd.org/changeset/base/343094

Log:
  iwn(4): (partially) rewrite A-MPDU Tx path

  Generic Tx stats fixes:
  - do not try to parse "aggregation status" for single frames; send them
  to iwn_tx_done() instead;
  - try to attach mbuf / node reference pair to reported BA events;
  allows to fix reported status for ieee80211_tx_complete() and ifnet counters
  (previously all A-MPDU frames were counted as failed - see PR 210211);
  requires few more firmware bug workarounds;
  - preserve short / long retry counters for wlan_amrr(4)
  (disabled for now - causes significant performance degradation).
  - Add new IWN_DEBUG_AMPDU debug category.
  - Add one more check into iwn_tx_data() to prevent aggregation ring
  overflow.
  - Workaround 'seqno % 256' != 'current Tx slot' case (until D9195 is not
  in the tree).
  - Improve watchdog timer updates (previously watchdog check was omitted
  when at least one frame was transmitted).
  - Stop Tx when memory leak in currently used ring was detected (unlikely
  to happen).
  - Few other minor fixes.

  Was previously tested with:
   - Intel 6205, STA mode (Tx aggregation behaves much better now).
   - Intel 4965AGN, STA mode (still unstable).

  PR:           192641, 210211
  Reviewed by:  adrian, dhw
  MFC after:    1 month
  Differential Revision:        https://reviews.freebsd.org/D10728

Changes:
  head/sys/dev/iwn/if_iwn.c
  head/sys/dev/iwn/if_iwn_debug.h
  head/sys/dev/iwn/if_iwnreg.h
  head/sys/dev/iwn/if_iwnvar.h

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