[RFC PATCH] btrfs: btrfs_mountpoint_expiry_timeout can be static

[kernel test robot <lkp@xxxxxxxxx>]

fs/btrfs/inode.c:5868:5: warning: symbol 'btrfs_mountpoint_expiry_timeout' was not declared. Should it be static?

Reported-by: kernel test robot <lkp@xxxxxxxxx>
Signed-off-by: kernel test robot <lkp@xxxxxxxxx>
---
 inode.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 8667a26d684d4..4f9472e41074a 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -5865,7 +5865,7 @@ static int btrfs_dentry_delete(const struct dentry *dentry)
 static void btrfs_expire_automounts(struct work_struct *work);
 static LIST_HEAD(btrfs_automount_list);
 static DECLARE_DELAYED_WORK(btrfs_automount_task, btrfs_expire_automounts);
-int btrfs_mountpoint_expiry_timeout = 500 * HZ;
+static int btrfs_mountpoint_expiry_timeout = 500 * HZ;
 static void btrfs_expire_automounts(struct work_struct *work)
 {
 	struct list_head *list = &btrfs_automount_list;