[dia] Don't use deprecated function gdk_pixmap_ref().

[Hans Breuer <hans src gnome org>]

commit 5e56f425e23c502edd17898607b7d50c19d8f630
Author: Adam Buchbinder <adam buchbinder gmail com>
Date:   Mon May 4 12:19:41 2009 -0400

    Don't use deprecated function gdk_pixmap_ref().
    
    Replaced gdk_pixmap_ref() with g_object_ref():
    http://library.gnome.org/devel/gdk/stable/gdk-Bitmaps-and-Pixmaps.html#gdk-pixmap-ref
    
    Signed-off-by: Adam Buchbinder <adam buchbinder gmail com>
    Signed-off-by: Hans Breuer <hans breuer org>
---
 lib/render_pixmap.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/lib/render_pixmap.c b/lib/render_pixmap.c
index 19d0e6e..6bf9bbf 100644
--- a/lib/render_pixmap.c
+++ b/lib/render_pixmap.c
@@ -80,7 +80,7 @@ renderer_pixmap_set_pixmap (DiaRenderer *ren,
   if (renderer->gc != NULL)
     g_object_unref(renderer->gc);
 
-  gdk_pixmap_ref(drawable);
+  g_object_ref(drawable);
   renderer->pixmap = drawable;
   renderer->gc = gdk_gc_new(drawable);