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

[Hans Breuer <hans src gnome org>]

commit a2abbf5835c0ddf42580a9bd663e43063bcbb112
Author: Adam Buchbinder <adam buchbinder gmail com>
Date:   Mon May 4 12:15:04 2009 -0400

    Don't use deprecated function gdk_gc_unref().
    
    Replaced gdk_gc_unref() with g_object_unref():
    http://library.gnome.org/devel/gdk/stable/gdk-Graphics-Contexts.html#gdk-gc-unref
    
    Signed-off-by: Adam Buchbinder <adam buchbinder gmail com>
    Signed-off-by: Hans Breuer <hans breuer org>
---
 app/diapagelayout.c  |    2 +-
 app/modify_tool.c    |    2 +-
 lib/diagdkrenderer.c |    2 +-
 lib/render_pixmap.c  |    2 +-
 4 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/app/diapagelayout.c b/app/diapagelayout.c
index a9c9a3a..b730bf8 100644
--- a/app/diapagelayout.c
+++ b/app/diapagelayout.c
@@ -813,7 +813,7 @@ dia_page_layout_destroy(GtkObject *object)
   DiaPageLayout *self = DIA_PAGE_LAYOUT(object);
 
   if (self->gc) {
-    gdk_gc_unref(self->gc);
+    g_object_unref(self->gc);
     self->gc = NULL;
   }
 
diff --git a/app/modify_tool.c b/app/modify_tool.c
index 1b84f5e..75525da 100644
--- a/app/modify_tool.c
+++ b/app/modify_tool.c
@@ -101,7 +101,7 @@ free_modify_tool(Tool *tool)
 {
   ModifyTool *mtool = (ModifyTool *)tool;
   if (mtool->gc)
-    gdk_gc_unref(mtool->gc);
+    g_object_unref(mtool->gc);
   g_free(mtool);
 }
 
diff --git a/lib/diagdkrenderer.c b/lib/diagdkrenderer.c
index 7b1fef6..6ccf42f 100644
--- a/lib/diagdkrenderer.c
+++ b/lib/diagdkrenderer.c
@@ -191,7 +191,7 @@ renderer_finalize(GObject *object)
     g_object_unref(renderer->pixmap);
 
   if (renderer->gc != NULL)
-    gdk_gc_unref(renderer->gc);
+    g_object_unref(renderer->gc);
 
   if (renderer->clip_region != NULL)
     gdk_region_destroy(renderer->clip_region);
diff --git a/lib/render_pixmap.c b/lib/render_pixmap.c
index 665cdbf..19d0e6e 100644
--- a/lib/render_pixmap.c
+++ b/lib/render_pixmap.c
@@ -78,7 +78,7 @@ renderer_pixmap_set_pixmap (DiaRenderer *ren,
     g_object_unref(renderer->pixmap);
 
   if (renderer->gc != NULL)
-    gdk_gc_unref(renderer->gc);
+    g_object_unref(renderer->gc);
 
   gdk_pixmap_ref(drawable);
   renderer->pixmap = drawable;