constify security_path_truncate()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
index 9713037..83e9c3c 100644
--- a/security/apparmor/lsm.c
+++ b/security/apparmor/lsm.c
@@ -269,7 +269,7 @@
 	return common_perm_create(OP_MKNOD, dir, dentry, AA_MAY_CREATE, mode);
 }
 
-static int apparmor_path_truncate(struct path *path)
+static int apparmor_path_truncate(const struct path *path)
 {
 	struct path_cond cond = { d_backing_inode(path->dentry)->i_uid,
 				  d_backing_inode(path->dentry)->i_mode
diff --git a/security/security.c b/security/security.c
index 3644b034..23ffb6c 100644
--- a/security/security.c
+++ b/security/security.c
@@ -478,7 +478,7 @@
 }
 EXPORT_SYMBOL(security_path_rename);
 
-int security_path_truncate(struct path *path)
+int security_path_truncate(const struct path *path)
 {
 	if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry))))
 		return 0;
diff --git a/security/tomoyo/tomoyo.c b/security/tomoyo/tomoyo.c
index cbf3df4..8573eee 100644
--- a/security/tomoyo/tomoyo.c
+++ b/security/tomoyo/tomoyo.c
@@ -150,7 +150,7 @@
  *
  * Returns 0 on success, negative value otherwise.
  */
-static int tomoyo_path_truncate(struct path *path)
+static int tomoyo_path_truncate(const struct path *path)
 {
 	return tomoyo_path_perm(TOMOYO_TYPE_TRUNCATE, path, NULL);
 }