signals: send_sigqueue: don't forget about handle_stop_signal()

send_group_sigqueue() calls handle_stop_signal(), send_sigqueue() doesn't.
This is not consistent and in fact I'd say this is (minor) bug.

Move handle_stop_signal() from send_group_sigqueue() to do_send_sigqueue(),
the latter is called by send_sigqueue() too.
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kernel/signal.c

@@ -1276,6 +1276,8 @@ void sigqueue_free(struct sigqueue *q)
 static int do_send_sigqueue(int sig, struct sigqueue *q, struct task_struct *t,
 				struct sigpending *pending)
 {
+	handle_stop_signal(sig, t);
+
 	if (unlikely(!list_empty(&q->list))) {
 		/*
 		 * If an SI_TIMER entry is already queue just increment
@@ -1335,7 +1337,6 @@ send_group_sigqueue(int sig, struct sigqueue *q, struct task_struct *p)
 	read_lock(&tasklist_lock);
 	/* Since it_lock is held, p->sighand cannot be NULL. */
 	spin_lock_irqsave(&p->sighand->siglock, flags);
-	handle_stop_signal(sig, p);
 
 	ret = do_send_sigqueue(sig, q, p, &p->signal->shared_pending);