handler: syslog error if file does not exist

Report via syslog that file does not exist.

src/handler.c

@@ -41,6 +41,8 @@ static int tip_client_file_not_found(struct tip_client *cli)
 
 	send(tip_client_socket(cli), buf, strlen(buf), 0);
 
+	syslog(LOG_ERR, "Requested file `%s' does not exist", cli->path);
+
 	return -1;
 }