constify security_sb_pivotroot()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/include/linux/security.h b/include/linux/security.h
index cb53cff..fcfa211 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -225,7 +225,7 @@
 int security_sb_mount(const char *dev_name, const struct path *path,
 		      const char *type, unsigned long flags, void *data);
 int security_sb_umount(struct vfsmount *mnt, int flags);
-int security_sb_pivotroot(struct path *old_path, struct path *new_path);
+int security_sb_pivotroot(const struct path *old_path, const struct path *new_path);
 int security_sb_set_mnt_opts(struct super_block *sb,
 				struct security_mnt_opts *opts,
 				unsigned long kern_flags,
@@ -542,8 +542,8 @@
 	return 0;
 }
 
-static inline int security_sb_pivotroot(struct path *old_path,
-					struct path *new_path)
+static inline int security_sb_pivotroot(const struct path *old_path,
+					const struct path *new_path)
 {
 	return 0;
 }