[drwright] Replace assert with type sanity check

[Christian Persch <chpe src gnome org>]

commit de099fe9ff134ab8141c22f083bcb88f319f9774
Author: Christian Persch <chpe gnome org>
Date:   Thu Sep 29 22:10:19 2011 +0200

    Replace assert with type sanity check

 src/drw-cc-panel.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/src/drw-cc-panel.c b/src/drw-cc-panel.c
index 1e4f404..f728f5c 100644
--- a/src/drw-cc-panel.c
+++ b/src/drw-cc-panel.c
@@ -247,7 +247,10 @@ drw_cc_panel_register_type (GTypeModule *module)
   };
 
   parent_type = g_type_from_name ("CcPanel");
-  g_assert (parent_type != G_TYPE_INVALID);
+  if (parent_type == 0 || !g_type_is_a (parent_type, GTK_TYPE_WIDGET)) {
+    drw_cc_panel_type = G_TYPE_INVALID;
+    return;
+  }
 
   g_type_query (parent_type, &query);
   type_info.class_size = query.class_size;