[PATCH -next] dlm: use DEFINE_MUTEX() for mutex lock

[Ye Bin]

mutex lock can be initialized automatically with DEFINE_MUTEX()
rather than explicitly calling mutex_init().

Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Signed-off-by: Ye Bin <yebin10@xxxxxxxxxx>
---
 fs/dlm/debug_fs.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/fs/dlm/debug_fs.c b/fs/dlm/debug_fs.c
index d5bd990bcab8..327a69598de5 100644
--- a/fs/dlm/debug_fs.c
+++ b/fs/dlm/debug_fs.c
@@ -20,7 +20,7 @@
 
 #define DLM_DEBUG_BUF_LEN 4096
 static char debug_buf[DLM_DEBUG_BUF_LEN];
-static struct mutex debug_buf_lock;
+static DEFINE_MUTEX(debug_buf_lock);
 
 static struct dentry *dlm_root;
 
@@ -795,7 +795,6 @@ void dlm_create_debug_file(struct dlm_ls *ls)
 
 void __init dlm_register_debugfs(void)
 {
-	mutex_init(&debug_buf_lock);
 	dlm_root = debugfs_create_dir("dlm", NULL);
 }