sched: domain sysctl fixes: add terminator comment

we had an incorrect-terminator bug in sd_alloc_ctl_domain_table()
before, so add a comment that documents it.

Signed-off-by: Milton Miller <miltonm@bga.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/sched.c b/kernel/sched.c
index f40fe02..9887ca00 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -5303,6 +5303,7 @@
 		sizeof(int), 0644, proc_dointvec_minmax);
 	set_table_entry(&table[10], "flags", &sd->flags,
 		sizeof(int), 0644, proc_dointvec_minmax);
+	/* &table[11] is terminator */
 
 	return table;
 }