XFA: Upgrade to libtiff 4.0.6.

third_party/libtiff/tif_dirwrite.c

Index: third_party/libtiff/tif_dirwrite.c
diff --git a/third_party/tiff_v403/tif_dirwrite.c b/third_party/libtiff/tif_dirwrite.c
similarity index 99%
rename from third_party/tiff_v403/tif_dirwrite.c
rename to third_party/libtiff/tif_dirwrite.c
index fa20609e2bd49dd5ab7723538fbfcc21e0d7a582..a0fd8dc2f62215ba623a67e0f9623b5371b4ec25 100644
--- a/third_party/tiff_v403/tif_dirwrite.c
+++ b/third_party/libtiff/tif_dirwrite.c
@@ -1,4 +1,4 @@
-/* $Id: tif_dirwrite.c,v 1.77 2012-07-06 19:18:31 bfriesen Exp $ */
+/* $Id: tif_dirwrite.c,v 1.78 2015-05-31 00:38:46 bfriesen Exp $ */
 
 /*
  * Copyright (c) 1988-1997 Sam Leffler
@@ -2839,14 +2839,15 @@ _TIFFRewriteField(TIFF* tif, uint16 tag, TIFFDataType in_datatype,
                          "Error writing directory link");
             return (0);
         }
-        
-        _TIFFfree( buf_to_write );
     }
     else
     {
         memcpy( &entry_offset, buf_to_write, count*TIFFDataWidth(datatype));
     }
 
+    _TIFFfree( buf_to_write );
+    buf_to_write = 0;
+
 /* -------------------------------------------------------------------- */
 /*      Adjust the directory entry.                                     */
 /* -------------------------------------------------------------------- */