The null-ptr-deref problem fixed in the following patch is hit on older
branches.

The patch failed to be initially backported into stable branches older
than 5.15 due to the fix-spell-comment commit ab4040df6efb ("mac80211: fix
some spelling mistakes"). Now it can be cleanly applied to the 5.4/5.10
stable branches.

I'm not sure if the comment-fix patch should be backported in these cases,
too (to prevent similar potential future backport fails). Probably not.
So I just adapted the backport patch in-place.