constify security_path_chroot()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/security/tomoyo/tomoyo.c b/security/tomoyo/tomoyo.c
index 6a858f2..c7764bb 100644
--- a/security/tomoyo/tomoyo.c
+++ b/security/tomoyo/tomoyo.c
@@ -385,7 +385,7 @@
  *
  * Returns 0 on success, negative value otherwise.
  */
-static int tomoyo_path_chroot(struct path *path)
+static int tomoyo_path_chroot(const struct path *path)
 {
 	return tomoyo_path_perm(TOMOYO_TYPE_CHROOT, path, NULL);
 }