constify chown_common/security_path_chown

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/security/tomoyo/tomoyo.c b/security/tomoyo/tomoyo.c
index 8573eee..f0989ec 100644
--- a/security/tomoyo/tomoyo.c
+++ b/security/tomoyo/tomoyo.c
@@ -366,7 +366,7 @@
  *
  * Returns 0 on success, negative value otherwise.
  */
-static int tomoyo_path_chown(struct path *path, kuid_t uid, kgid_t gid)
+static int tomoyo_path_chown(const struct path *path, kuid_t uid, kgid_t gid)
 {
 	int error = 0;
 	if (uid_valid(uid))