kernel: merge a proposed fix from LKML for fixing infinite data returned by /proc/timer_list

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

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@37484 3c298f89-4303-0410-b956-a3cf2f4a3e73