locking/stat: Fix a typo

s/STATS/STAT

Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1359019365-23646-1-git-send-email-yuanhan.liu@linux.intel.com


Signed-off-by: Ingo Molnar <mingo@kernel.org>