netlink: flush stdout after each event in monitor mode

So we get all events when redirecting them to file, ie.

	# nftables monitor > file

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/netlink.c b/src/netlink.c
index a9050093..4371c0a1 100644
--- a/src/netlink.c
+++ b/src/netlink.c
@@ -2143,6 +2143,7 @@ static int netlink_events_cb(const struct nlmsghdr *nlh, void *data)
 		ret = netlink_events_rule_cb(nlh, type, monh);
 		break;
 	}
+	fflush(stdout);
 
 	return ret;
 }