This patch was copied from a more recent backports versions. This fixes
a build problem with kernel < 3.6.
This closes#14475
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38833 3c298f89-4303-0410-b956-a3cf2f4a3e73