ath9k: fix some issues in PA predistortion (still disabled by default)

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

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@36744 3c298f89-4303-0410-b956-a3cf2f4a3e73
odhcp6c: fix or debug disappearing IPv6 addresses

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@36745 3c298f89-4303-0410-b956-a3cf2f4a3e73