wifi: mac80211: Don't call fq_flow_idx() for management frames

wifi: mac80211: Don't call fq_flow_idx() for management frames

[ Upstream commit cb3bb3d88dfcd177a1050c0a009a3ee147b2e5b9 ]

skb_get_hash() can only be used when the skb is linked to a netdev
device.

Signed-off-by: Alexander Wetzel <Alexander@wetzel-home.de>
Fixes: 73bc9e0af594 ("mac80211: don't apply flow control on management frames")
Link: https://patch.msgid.link/20250717162547.94582-3-Alexander@wetzel-home.de
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>