libtiff: struct tiff: remove unused tif_dirlistoff

From 1123f312b4a2cdba920ed42dc5793cc876bb9982 Mon Sep 17 00:00:00 2001
From: Even Rouault <[EMAIL REDACTED]>
Date: Fri, 6 Jan 2023 15:18:36 +0100
Subject: [PATCH] struct tiff: remove unused tif_dirlistoff

---
 libtiff/tiffiop.h | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/libtiff/tiffiop.h b/libtiff/tiffiop.h
index bf8afb2a..f593163e 100644
--- a/libtiff/tiffiop.h
+++ b/libtiff/tiffiop.h
@@ -143,11 +143,9 @@ struct tiff
 #define TIFF_CHOPPEDUPARRAYS                                                   \
     0x4000000U /* set when allocChoppedUpStripArrays() has modified strip      \
                   array */
-    uint64_t tif_diroff;      /* file offset of current directory */
-    uint64_t tif_nextdiroff;  /* file offset of following directory */
-    uint64_t tif_lastdiroff;  /* file offset of last directory written so far */
-    uint64_t *tif_dirlistoff; /* list of offsets to already seen directories to
-                                 prevent IFD looping */
+    uint64_t tif_diroff;     /* file offset of current directory */
+    uint64_t tif_nextdiroff; /* file offset of following directory */
+    uint64_t tif_lastdiroff; /* file offset of last directory written so far */
     TIFFHashSet *tif_map_dir_offset_to_number;
     TIFFHashSet *tif_map_dir_number_to_offset;
     tdir_t tif_dirnumber;  /* number of already seen directories */