torture: Don't leak shuffle_tmp_mask when shuffler kthread fails to start

If torture_shuffle_init() successfully allocates shuffle_tmp_mask but
then fails to create the torture_shuffle kthread, the cpumask is never
freed.

Free the cpumask directly on the kthread-creation error path.

Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

kernel/torture.c

@@ -577,6 +577,8 @@ static int torture_shuffle(void *arg)
  */
 int torture_shuffle_init(long shuffint)
 {
+	int ret;
+
 	shuffle_interval = shuffint;
 
 	shuffle_idle_cpu = -1;
@@ -587,7 +589,10 @@ int torture_shuffle_init(long shuffint)
 	}
 
 	/* Create the shuffler thread */
-	return torture_create_kthread(torture_shuffle, NULL, shuffler_task);
+	ret = torture_create_kthread(torture_shuffle, NULL, shuffler_task);
+	if (ret)
+		free_cpumask_var(shuffle_tmp_mask);
+	return ret;
 }
 EXPORT_SYMBOL_GPL(torture_shuffle_init);