Free some memory

src/ui/core.c

@@ -137,6 +137,7 @@ _ui_get_idle_time(void)
         XFree(info);
         return result;
     }
+    XFree(info);
 // if no libxss or xss idle time failed, use profanity idle time
 #endif
     gdouble seconds_elapsed = g_timer_elapsed(ui_idle_time, NULL);