service: don't leak a file descriptor

CID 190777 (#1 of 1): Resource leak (RESOURCE_LEAK)
15. leaked_handle: Handle variable server_fd going out of scope leaks the handle.
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

criu/cr-service.c

@@ -1207,7 +1207,7 @@ int cr_service(bool daemon_mode)
 		goto err;
 
 	if (close_status_fd())
-		return -1;
+		goto err;
 
 	while (1) {
 		int sk;