[dia] [scan-build] Null dereference (not really)

[Hans Breuer <hans src gnome org>]

commit d5d0ebda470fa6e5865f70505411fd25f2c8dc64
Author: Hans Breuer <hans breuer org>
Date:   Sun Dec 13 14:11:53 2009 +0100

    [scan-build] Null dereference (not really)
    
    Document create_layer_dialog() making a valid layer_dialog
    pointer by g_assert() to silence scan-build.

 app/layer_dialog.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/app/layer_dialog.c b/app/layer_dialog.c
index ca90e29..34d006b 100644
--- a/app/layer_dialog.c
+++ b/app/layer_dialog.c
@@ -691,6 +691,7 @@ layer_dialog_update_diagram_list(void)
     else
       create_layer_dialog();
   }
+  g_assert(layer_dialog != NULL); /* must be valid now */
   /* oh this options: here integrated UI ;( */
   if (!layer_dialog->diagram_omenu)
     return;
@@ -762,6 +763,7 @@ layer_dialog_show()
   {   
   if (layer_dialog == NULL || layer_dialog->dialog == NULL)
     create_layer_dialog();
+  g_assert(layer_dialog != NULL); /* must be valid now */
   gtk_window_present(GTK_WINDOW(layer_dialog->dialog));
   }
 }
@@ -794,6 +796,7 @@ layer_dialog_set_diagram(Diagram *dia)
 
   if (layer_dialog == NULL || layer_dialog->dialog == NULL) 
     create_layer_dialog(); /* May have been destroyed */
+  g_assert(layer_dialog != NULL); /* must be valid now */
 
   gtk_container_foreach (GTK_CONTAINER(layer_dialog->layer_list),
                          _layer_widget_clear_layer, NULL);