sched/deadline: Fix memory leak

Free cpudl->free_cpus allocated in cpudl_init().

Signed-off-by: Li Zefan <lizefan@huawei.com>
Acked-by: Juri Lelli <juri.lelli@gmail.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: <stable@vger.kernel.org> # 3.14+
Link: http://lkml.kernel.org/r/534F36CE.2000409@huawei.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

kernel/sched/cpudeadline.c

@@ -210,7 +210,5 @@ int cpudl_init(struct cpudl *cp)
  */
 void cpudl_cleanup(struct cpudl *cp)
 {
-	/*
-	 * nothing to do for the moment
-	 */
+	free_cpumask_var(cp->free_cpus);
 }