[dia] Bug 642764 - use png_jmpbuf() rather than direct member access

[Hans Breuer <hans src gnome org>]

commit 8e28086b95578d17386c3be9aea132064be829a0
Author: Hans Breuer <hans breuer org>
Date:   Sun Feb 27 21:32:47 2011 +0100

    Bug 642764 - use png_jmpbuf() rather than direct member access
    
    Fix from Hanno Boeck to make Dia compile with libpng 1.5
    https://bugzilla.gnome.org/show_bug.cgi?id=642764

 plug-ins/libart/export_png.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/plug-ins/libart/export_png.c b/plug-ins/libart/export_png.c
index 385e6b1..a8f219f 100644
--- a/plug-ins/libart/export_png.c
+++ b/plug-ins/libart/export_png.c
@@ -178,7 +178,7 @@ export_png_ok(GtkButton *button, gpointer userdata)
   }
 
   /* set error handling ... */
-  if (setjmp(png->jmpbuf)) {
+  if (setjmp(png_jmpbuf(png))) {
     fclose(fp);
     png_destroy_write_struct(&png, &info);
     message_error(_("Error occurred while writing PNG"));