Fix incorrect length passed to accept noted by Larry Doolittle.
diff --git a/nc.c b/nc.c
index 72439dd..b58bd6a 100644
--- a/nc.c
+++ b/nc.c
@@ -80,10 +80,12 @@
 	}
 
 	if (do_listen) {
+		socklen_t addrlen = sizeof(address);
+
 		if (listen(sfd, 1) < 0)
 			perror_msg_and_die("listen");
 
-		if ((tmpfd = accept(sfd, (struct sockaddr *) &address, &opt)) < 0)
+		if ((tmpfd = accept(sfd, (struct sockaddr *) &address, &addrlen)) < 0)
 			perror_msg_and_die("accept");
 
 		close(sfd);