Revert "plugins: do not pass potentially destroyed data to unload cal…

…lback"

This reverts commit 0252408.

src/plugins.c

@@ -948,10 +948,7 @@ plugin_free(Plugin *plugin)
 	/* cb_data_destroy might be plugin code and must be called before unloading the module. */
 	if (plugin->cb_data_destroy)
 		plugin->cb_data_destroy(plugin->cb_data);
-
-	/* If cb_data was destroyed above then we must not pass it to unload(). */
-	proxy->proxy_cbs.unload(&proxy->public, &plugin->public, plugin->proxy_data,
-	    plugin->cb_data_destroy ? NULL: proxy->cb_data);
+	proxy->proxy_cbs.unload(&proxy->public, &plugin->public, plugin->proxy_data, proxy->cb_data);
 
 	g_free(plugin->filename);
 	g_free(plugin);