kernel: fix a bridge issue that broke WDS client handling in 3.9+

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@37341 3c298f89-4303-0410-b956-a3cf2f4a3e73
mac80211: fix a crash in legacy minstrel when no STA exists

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@37342 3c298f89-4303-0410-b956-a3cf2f4a3e73