autofs: collect new pipe fd as used

This is essential to make sure, that we won't use the same pipe descriptor for
different pipes.
Otherwise we can run into problem with fd send via unix sockets.
Signed-off-by: Stanislav Kinsburskiy <skinsbursky@virtuozzo.com>
Tested-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

criu/autofs.c

@@ -704,6 +704,7 @@ static int autofs_create_fle(struct pstree_item *task, FdinfoEntry *fe,
 			     struct file_desc *desc)
 {
 	struct fdinfo_list_entry *le;
+	struct rst_info *rst_info = rsti(task);
 
 	le = shmalloc(sizeof(*le) + sizeof(int));
 	if (!le)
@@ -714,7 +715,9 @@ static int autofs_create_fle(struct pstree_item *task, FdinfoEntry *fe,
 	le->pid = task->pid.virt;
 	le->fe = fe;
 
-	collect_gen_fd(le, rsti(task));
+	collect_gen_fd(le, rst_info);
+
+	collect_used_fd(le, rst_info);
 
 	list_add_tail(&le->desc_list, &desc->fd_info_head);
 	le->desc = desc;