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iee80211_hwmp: Don't dereference NULL ni in debug printf.
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Authored by jhb on Dec 7 2022, 8:36 PM.
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Details

Summary

In this call to IEEE80211_NOTE, ni is always NULL due to the assignment
a few lines earlier at the start of the function. If debug traces are
enabled, then this will pass an invalid pointer as the 'mac' pointer to
ieee80211_note_mac. Use IEEE80211_DPRINTF which doesn't take a 'ni'
argument instead.

Reported by: GCC -Wstringop-overread

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rG FreeBSD src repository
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