cpuidle-haltpoll: Fix small typo

Fix a spelling typo in cpuidle-haltpoll.c.

Signed-off-by: Yihao Wu <wuyihao@linux.alibaba.com>
[ rjw: Subject & changelog ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
1 file changed