Free memory when plugin windows closed

src/plugins/api.c

@@ -303,6 +303,9 @@ api_win_create(
     void(*callback_destroy)(void *callback))
 {
     if (callbacks_win_exists(plugin_name, tag)) {
+        if (callback_destroy) {
+            callback_destroy(callback);
+        }
         return;
     }
 

src/ui/window.c

@@ -452,6 +452,7 @@ win_free(ProfWin* window)
     {
         ProfPluginWin *pluginwin = (ProfPluginWin*)window;
         free(pluginwin->tag);
+        free(pluginwin->plugin_name);
         break;
     }
     default: