netifd: update to latest version, fixes a NULL pointer deref bug

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

Backport of r36965

git-svn-id: svn://svn.openwrt.org/openwrt/branches/attitude_adjustment@36966 3c298f89-4303-0410-b956-a3cf2f4a3e73