quick fix of chained list loop

mini_serv_2.c

@@ -105,7 +105,7 @@ void add_client(t_client *first_client, int fd, int id) {
 		first_client = new_client;
 	else {
 		client = first_client;
-		while (client)
+		while (client->next)
 			client = client->next;
 		client->next = new_client;
 	}