- g_return_if_fail (thread);
- g_return_if_fail (thread->joinable);
- g_return_if_fail (!g_system_thread_equal (real->system_thread, zero_thread));
+ g_return_val_if_fail (thread, NULL);
+ g_return_val_if_fail (thread->joinable, NULL);
+ g_return_val_if_fail (!g_system_thread_equal (real->system_thread,
+ zero_thread), NULL);