wifi: mac80211: don't parse mbssid in assoc response

stable inclusion
from stable-v5.10.149
commit 353b5c8d4bea712774ccc631782ed8cc3630528a
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I6D0WY

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=353b5c8d4bea712774ccc631782ed8cc3630528a



--------------------------------

This is simply not valid and simplifies the next commit.
I'll make a separate patch for this in the current main
tree as well.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>
Reviewed-by: Zheng Zengkai <zhengzengkai@huawei.com>