File tiff-3.9.4-seek.patch of Package tiff.import4144

Index: libtiff/tiffiop.h
===================================================================
--- libtiff/tiffiop.h.orig
+++ libtiff/tiffiop.h
@@ -209,7 +209,7 @@ struct tiff {
 #define	TIFFWriteFile(tif, buf, size) \
 	((*(tif)->tif_writeproc)((tif)->tif_clientdata,buf,size))
 #define	TIFFSeekFile(tif, off, whence) \
-	((*(tif)->tif_seekproc)((tif)->tif_clientdata,(toff_t)(off),whence))
+	((tif)->tif_seekproc?((*(tif)->tif_seekproc)((tif)->tif_clientdata,(toff_t)(off),whence)):0)
 #define	TIFFCloseFile(tif) \
 	((*(tif)->tif_closeproc)((tif)->tif_clientdata))
 #define	TIFFGetFileSize(tif) \
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