wifi: mac80211: drop bogus static keywords in A-MSDU rx

These were unintentional copy&paste mistakes.

Cc: stable@vger.kernel.org
Fixes: 986e43b1

 ("wifi: mac80211: fix receiving A-MSDU frames on mesh interfaces")
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Link: https://lore.kernel.org/r/20230330090001.60750-1-nbd@nbd.name
Signed-off-by: Johannes Berg <johannes.berg@intel.com>