[][MAC80211][wed][fix some possible NULL pointer dereferences]

[Description]
Fix some possible NULL pointer dereferences
sync upstream patches

[Release-log]
N/A

Change-Id: I17dcda8c3304f7e989c332c815982ad4bc004fb4
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6929459
1 file changed