Fix potentially uninitialized value.

third_party/libtiff/tif_dirread.c

 /* $Id: tif_dirread.c,v 1.191 2015-09-05 20:31:41 bfriesen Exp $ */
 
 /*
  * Copyright (c) 1988-1997 Sam Leffler
  * Copyright (c) 1991-1997 Silicon Graphics, Inc.
  *
  * Permission to use, copy, modify, distribute, and sell this software and
  * its documentation for any purpose is hereby granted without fee, provided
  * that (i) the above copyright notices and this permission notice appear in
  * all copies of the software and related documentation, and (ii) the names of
@@ skipping 4425 matching lines @@
  * nextdiroff variable has been specified, read it too. Function returns a
  * number of fields in the directory or 0 if failed.
  */
 static uint16
 TIFFFetchDirectory(TIFF* tif, uint64 diroff, TIFFDirEntry** pdir,
                    uint64 *nextdiroff)
 {
         static const char module[] = "TIFFFetchDirectory";
 
         void* origdir;
-        uint16 dircount16;
+        uint16 dircount16 = 0;
         uint32 dirsize;
         TIFFDirEntry* dir;
         uint8* ma;
         TIFFDirEntry* mb;
         uint16 n;
 
         assert(pdir);
 
         tif->tif_diroff = diroff;
         if (nextdiroff)
@@ skipping 1150 matching lines @@
 
 
 /* vim: set ts=8 sts=8 sw=8 noet: */
 /*
  * Local Variables:
  * mode: c
  * c-basic-offset: 8
  * fill-column: 78
  * End:
  */