[libchamplain] Use correct cast

[Jiří Techet <jiritechet src gnome org>]

commit 1e084cef16a3587eab4e6462ccc3cf1d007528ef
Author: JiÅ?í Techet <techet gmail com>
Date:   Fri May 14 21:16:09 2010 +0200

    Use correct cast
    
    Signed-off-by: JiÅ?í Techet <techet gmail com>

 champlain/champlain-map-source-factory.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/champlain/champlain-map-source-factory.c b/champlain/champlain-map-source-factory.c
index 6f8b46d..3097652 100644
--- a/champlain/champlain-map-source-factory.c
+++ b/champlain/champlain-map-source-factory.c
@@ -141,7 +141,7 @@ champlain_map_source_factory_constructor (GType type,
           (type, n_construct_params, construct_params);
 
       instance = CHAMPLAIN_MAP_SOURCE_FACTORY (retval);
-      g_object_add_weak_pointer (retval, (gpointer) &instance);
+      g_object_add_weak_pointer (retval, (gpointer *) &instance);
     }
   else
     {