percpu: clear memory allocated with the km allocator

Percpu allocator should clear memory before returning it but the km
allocator forgot to do it.  Fix it.

Signed-off-by: Tejun Heo <[email protected]>
Reported-by: Peter Zijlstra <[email protected]>
Acked-by: Peter Zijlstra <[email protected]>
1 file changed