core: Init fdstore even earlier

Next patch will move SELF_STDIN_OFF sfd to fdstore.
This patch moves fdstore_init() before tty_prep_fds().

v4: New
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

criu/cr-restore.c

@@ -2282,6 +2282,9 @@ int cr_restore_tasks(void)
 	if (prepare_pstree() < 0)
 		goto err;
 
+	if (fdstore_init())
+		goto err;
+
 	if (crtools_prepare_shared() < 0)
 		goto err;