try adjusting marshal types

icontainer and watch were declaring some signals as taking objevct
arguments, but using a simple pointer marshal function. This is harmless
on Debian-dervived distros, but redhat seem to build glib with
run-time time checks which spot this and NULL out pointers, causing a
crash.

See #75

Author: jcupitt

src/icontainer.c

@@ -795,7 +795,7 @@ icontainer_class_init( iContainerClass *class )
 		G_SIGNAL_RUN_LAST,
 		G_STRUCT_OFFSET( iContainerClass, child_remove ),
 		NULL, NULL,
-		g_cclosure_marshal_VOID__POINTER,
+		g_cclosure_marshal_VOID__OBJECT,
 		G_TYPE_NONE, 1,
 		TYPE_ICONTAINER );
 
@@ -804,7 +804,7 @@ icontainer_class_init( iContainerClass *class )
 		G_SIGNAL_RUN_LAST,
 		G_STRUCT_OFFSET( iContainerClass, current ),
 		NULL, NULL,
-		g_cclosure_marshal_VOID__POINTER,
+		g_cclosure_marshal_VOID__OBJECT,
 		G_TYPE_NONE, 1,
 		TYPE_ICONTAINER );
 
@@ -813,7 +813,7 @@ icontainer_class_init( iContainerClass *class )
 		G_SIGNAL_RUN_LAST,
 		G_STRUCT_OFFSET( iContainerClass, child_detach ),
 		NULL, NULL,
-		g_cclosure_marshal_VOID__POINTER,
+		g_cclosure_marshal_VOID__OBJECT,
 		G_TYPE_NONE, 1,
 		TYPE_ICONTAINER );
 

src/watch.c

@@ -61,9 +61,9 @@ watchgroup_class_init( WatchgroupClass *class )
 		G_SIGNAL_RUN_FIRST,
 		G_STRUCT_OFFSET( WatchgroupClass, watch_changed ),
 		NULL, NULL,
-		g_cclosure_marshal_VOID__POINTER,
+		g_cclosure_marshal_VOID__OBJECT,
 		G_TYPE_NONE, 1,
-		G_TYPE_POINTER );
+		TYPE_WATCH );
 }
 
 static void