constify security_path_chroot()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
index 52c2ac5..e2baca4 100644
--- a/include/linux/lsm_hooks.h
+++ b/include/linux/lsm_hooks.h
@@ -1376,7 +1376,7 @@
 				struct dentry *new_dentry);
 	int (*path_chmod)(const struct path *path, umode_t mode);
 	int (*path_chown)(const struct path *path, kuid_t uid, kgid_t gid);
-	int (*path_chroot)(struct path *path);
+	int (*path_chroot)(const struct path *path);
 #endif
 
 	int (*inode_alloc_security)(struct inode *inode);