[libpng17] Removed extra line left over from recent patch to pngwutil.c
diff --git a/pngwutil.c b/pngwutil.c
index be4f542..5fb7d2b 100644
--- a/pngwutil.c
+++ b/pngwutil.c
@@ -1742,7 +1742,6 @@
    {
       if (png_text_compress(png_ptr, png_iTXt, &comp, prefix_len) != Z_OK)
          png_error(png_ptr, png_ptr->zstream.msg);
-      png_write_chunk_header(png_ptr, png_iTXt, comp.output_len + prefix_len);
    }
 
    else