Fix a leak when TIFFRGBAImageBegin fails

third_party/libtiff/tif_getimage.c

Index: third_party/libtiff/tif_getimage.c
diff --git a/third_party/libtiff/tif_getimage.c b/third_party/libtiff/tif_getimage.c
index 85237937ec83d96552558e0e86e38331ae8be818..97fa94dbe7be86a9f2971c15de35a4bd14ed6e43 100644
--- a/third_party/libtiff/tif_getimage.c
+++ b/third_party/libtiff/tif_getimage.c
@@ -478,10 +478,7 @@ TIFFRGBAImageBegin(TIFFRGBAImage* img, TIFF* tif, int stop, char emsg[1024])
 	return 1;
 
   fail_return:
-        _TIFFfree( img->redcmap );
-        _TIFFfree( img->greencmap );
-        _TIFFfree( img->bluecmap );
-        img->redcmap = img->greencmap = img->bluecmap = NULL;
+        TIFFRGBAImageEnd(img);
         return 0;
 }