[PATCH] thread-group SIGSTOP handling

Fix thread-group SIGSTOP handling - the SIGSTOP notification was not
propagated to the parent of the thread group leader.  Now Ctrl-Z-ing of
thread groups works again.

kernel/signal.c

@@ -1127,8 +1127,6 @@ void do_notify_parent(struct task_struct *tsk, int sig)
 	struct siginfo info;
 	int why, status;
 
-	if (!tsk->ptrace && delay_group_leader(tsk))
-		return;
 	if (sig == -1)
 		BUG();