fix leaked client socket after receiving file

source/Main.cpp

@@ -2,6 +2,7 @@
 #include "util.hpp"
 #include "main.hpp"
 #include <server.hpp>
+#include <client.hpp>
 #include <unistd.h>
 
 static int nxlink_sock = -1;
@@ -22,7 +23,8 @@ extern "C" void userAppInit() {
 
 extern "C" void userAppExit() {
     cancelServerTransfer();
-    for (int i = 0; i < 150 && !isServerWorkersIdle(); i++) {
+    cancelClientTransfer();
+    for (int i = 0; i < 150 && (!isServerWorkersIdle() || !isClientWorkersIdle()); i++) {
         usleep(10000);
     }
     if (nxlink_sock != -1) {