test/{read_conf,run_filter}: convert to C++

test/read_conf.cxx

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2011 The Music Player Daemon Project
+ * Copyright (C) 2003-2013 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify

test/run_filter.cxx

@@ -19,7 +19,11 @@
 
 #include "config.h"
 #include "conf.h"
+
+extern "C" {
 #include "audio_parser.h"
+}
+
 #include "audio_format.h"
 #include "filter_plugin.h"
 #include "pcm_volume.h"
@@ -75,7 +79,7 @@ load_filter(const char *name)
 	param = find_named_config_block("filter", name);
 	if (param == NULL) {
 		g_printerr("No such configured filter: %s\n", name);
-		return false;
+		return nullptr;
 	}
 
 	filter = filter_configured_new(param, &error);