ast_event_unsubscribe in 1.6.0 returns void, not NULL.

Pointed out by Stefan Gofferje on the asterisk-users mailing list.


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.6.0@143735 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_agent.c

@@ -2493,7 +2493,8 @@ static int unload_module(void)
 	ast_channel_unregister(&agent_tech);
 	/* Delete devicestate subscription */
 	if (agent_devicestate_sub) {
-		agent_devicestate_sub = ast_event_unsubscribe(agent_devicestate_sub);
+		ast_event_unsubscribe(agent_devicestate_sub);
+		agent_devicestate_sub = NULL;
 	}
 	/* Unregister dialplan functions */
 	ast_custom_function_unregister(&agent_function);