keep client retries when tip_client_request_file fails

Keep client retry count when something goes wrong requesting
file size (HEAD request).

Fixes a bug where tiptorrent-client keeps sending HEAD requests
indifinitely when something goes wrong at this stage.

src/main.c

@@ -552,6 +552,7 @@ int main(int argc, char *argv[])
 		return EXIT_FAILURE;
 	}
 	addr = argv[1];
+	filename = argv[2];
 
 	openlog("tiptorrent-client", LOG_PID, LOG_DAEMON);
 
@@ -562,8 +563,7 @@ int main(int argc, char *argv[])
 	gettimeofday(&tv_start, NULL);
 
 	do {
-		filename = argv[2];
-		memset(&_cli, 0, sizeof(_cli));
+		tip_client_reset_state(&_cli, -1, 0);
 		_cli.state = TIP_CLIENT_HEAD_HEADER;
 		ret = tip_client_request_file(&_cli, addr, filename);
 	} while (ret > 0);