mac80211: Reject zero MAC address in sta_info_insert_check()

As commit 52dba8d7 ("mac80211: reject zero MAC address in add station")
said, we don't consider all-zeroes to be a valid MAC address in most places,
so also reject it here.

Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Link: https://lore.kernel.org/r/20210626130334.13624-1-yuehaibing@huawei.com


Signed-off-by: Johannes Berg <johannes.berg@intel.com>