util/epoll: do not report polling timeout

It's not really interesting and just pollutes the log
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

criu/util.c

@@ -1260,8 +1260,6 @@ int epoll_run_rfds(int epollfd, struct epoll_event *evs, int nr_fds, int timeout
 		if (ret <= 0) {
 			if (ret < 0)
 				pr_perror("polling failed");
-			else
-				pr_debug("polling timeout\n");
 			break;
 		}