Btrfs: make things static and include the right headers

Shut up various sparse warnings about symbols that should be either
static or have their declarations in scope.

Signed-off-by: Christoph Hellwig <hch@lst.de>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 1975ea273dc3..93a21c77064a 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -647,7 +647,7 @@ static int btrfs_interface_init(void)
         return misc_register(&btrfs_misc);
 }
 
-void btrfs_interface_exit(void)
+static void btrfs_interface_exit(void)
 {
         if (misc_deregister(&btrfs_misc) < 0)
                 printk("misc_deregister failed for control device");