[Bug 283903] rtw88: possible skb leak

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=283903

--- Comment #7 from Guillaume Outters <guillaume-freebsd@outters.eu> ---
Whoops, I got a new one!
After an uptime of more than 2 days without any problem, I once again had two
killed processes yesterday evening (while building GHC, the Haskell compiler),
and then this morning while trying a big rsync, an "skb alloc failed" loop
happened.

Jan  8 16:01:44 Boot
Jan 10 22:26:56 pasdfric kernel: pid 9508 (firefox), jid 0, uid 1001, was
killed: failed to reclaim memory
Jan 10 22:36:53 pasdfric kernel: pid 78425 (ghc), jid 0, uid 1001, was killed:
failed to reclaim memory
Jan 11 11:20:18 pasdfric kernel: rtw880: ERROR lkpi_80211_txq_tx_one: skb alloc
failed
Jan 11 11:20:19 pasdfric kernel: rtw880: ERROR lkpi_80211_txq_tx_one: skb alloc
failed
Jan 11 11:21:38 pasdfric kernel: rtw880: ERROR lkpi_80211_txq_tx_one: skb alloc
failed
[…]

At 14:00 my rsync still ran, but at about 10 KB/s.
Here is the vmstat -m (with everything lkpi-related):

            Type  Use Memory Req Size(s)
       lkpi80211   35 42112   39 128,256,1024,2048,32768
     lkpikmalloc 7531 17555504 260476706
16,32,64,128,256,384,512,1024,2048,4096,8192,16384,32768,65536
          lkpifw   12   384   24 32,128
         lkpiskb 580877 2391855104 8175104

If I read well that makes *2 GB* for lkpiskb???
After a reboot, the rsync finished really quickly (can't estimate at which
speed, but many MB/s)

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