constify security_path_chroot()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/security/security.c b/security/security.c
index 33b85a9..cf6f31d 100644
--- a/security/security.c
+++ b/security/security.c
@@ -499,7 +499,7 @@
 	return call_int_hook(path_chown, 0, path, uid, gid);
 }
 
-int security_path_chroot(struct path *path)
+int security_path_chroot(const struct path *path)
 {
 	return call_int_hook(path_chroot, 0, path);
 }