make simple_pin_fs() pass MS_KERNMOUNT - it's a kernel-internal one

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/libfs.c b/fs/libfs.c
index 7c895a7..722e0d5 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -534,7 +534,7 @@
 	spin_lock(&pin_fs_lock);
 	if (unlikely(!*mount)) {
 		spin_unlock(&pin_fs_lock);
-		mnt = vfs_kern_mount(type, 0, type->name, NULL);
+		mnt = vfs_kern_mount(type, MS_KERNMOUNT, type->name, NULL);
 		if (IS_ERR(mnt))
 			return PTR_ERR(mnt);
 		spin_lock(&pin_fs_lock);