fix warning (use correct header file)
diff --git a/examples/ulog/test_ulog.c b/examples/ulog/test_ulog.c
index cbb6c4f..f9d2f6c 100644
--- a/examples/ulog/test_ulog.c
+++ b/examples/ulog/test_ulog.c
@@ -30,6 +30,7 @@
 #include <asm/types.h>
 #include <sys/socket.h>
 #include <sys/time.h>
+#include <time.h>
 #include <linux/netlink.h>
 #include <stdlib.h>
 #include <stdio.h>