When register_netdevice() failed in ieee80211_if_add(), ndev->tstats
isn't released. Fix it.

Fixes: 5a490510 ("mac80211: use per-CPU TX/RX statistics")
Signed-off-by: NZhengchao Shao <shaozhengchao@huawei.com>
Link: https://lore.kernel.org/r/20221117064500.319983-1-shaozhengchao@huawei.comSigned-off-by: NJohannes Berg <johannes.berg@intel.com>