[PATCH] cgroup: set 'start' with the right value in cgroup_path.

[Tao Ma]

From: Tao Ma <boyu.mt@xxxxxxxxxx>

'start' is set to buf + buflen and do the '--' immediately.
Just set it to 'buf + buflen - 1' directly.

Cc: Tejun Heo <tj@xxxxxxxxxx>
Cc: Li Zefan <lizefan@xxxxxxxxxx>
---
 kernel/cgroup.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index f24f724..a9f8388 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1821,9 +1821,9 @@ int cgroup_path(const struct cgroup *cgrp, char *buf, int buflen)
 		return 0;
 	}
 
-	start = buf + buflen;
+	start = buf + buflen - 1;
 
-	*--start = '\0';
+	*start = '\0';
 	for (;;) {
 		int len = dentry->d_name.len;
 
-- 
1.7.1

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