uffd: don't close the same descriptor twice

>>> >>>     CID 161322:  API usage errors  (USE_AFTER_FREE)
>>> >>>     Calling "close(int)" closes handle "client" which has already been closed.
Signed-off-by: Andrew Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

criu/uffd.c

@@ -288,7 +288,7 @@ static struct lazy_pages_info *ud_open(int listen, struct sockaddr_un *saddr)
 		goto out;
 	}
 	pr_debug("lpi->uffd %d\n", lpi->uffd);
-	close(client);
+	close_safe(&client);
 
 	pr_debug("uffd is 0x%d\n", lpi->uffd);
 	uffd_flags = fcntl(lpi->uffd, F_GETFD, NULL);
@@ -307,7 +307,7 @@ static struct lazy_pages_info *ud_open(int listen, struct sockaddr_un *saddr)
 
 out:
 	lpi_fini(lpi);
-	close(client);
+	close_safe(&client);
 	return NULL;
 }