btrfs, nfs, apparmor: don't pull mnt_namespace.h for no reason...

it's not needed anymore; we used to, back when we had to do
mount_subtree() by hand, complete with put_mnt_ns() in it.
No more...  Apparmor didn't need it since the __d_path() fix.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 200f63b..dc62d3c 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -40,7 +40,6 @@
 #include <linux/magic.h>
 #include <linux/slab.h>
 #include <linux/cleancache.h>
-#include <linux/mnt_namespace.h>
 #include <linux/ratelimit.h>
 #include "compat.h"
 #include "delayed-inode.h"
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 1347774..73d87f9 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -41,7 +41,6 @@
 #include <linux/lockd/bind.h>
 #include <linux/seq_file.h>
 #include <linux/mount.h>
-#include <linux/mnt_namespace.h>
 #include <linux/namei.h>
 #include <linux/nfs_idmap.h>
 #include <linux/vfs.h>
diff --git a/security/apparmor/path.c b/security/apparmor/path.c
index b566eba..9d070a7 100644
--- a/security/apparmor/path.c
+++ b/security/apparmor/path.c
@@ -13,7 +13,6 @@
  */
 
 #include <linux/magic.h>
-#include <linux/mnt_namespace.h>
 #include <linux/mount.h>
 #include <linux/namei.h>
 #include <linux/nsproxy.h>