Fixed networking flush algorithm for the file transfer

file/local_server/LocalFileTransfer.cpp

@@ -28,22 +28,11 @@ void transfer::free_buffer(Buffer* buffer) {
 }
 
 FileClient::~FileClient() {
-    {
-        auto head = this->network_buffer.buffer_head;
-        while (head) {
-            auto next = head->next;
-            free_buffer(head);
-            head = next;
-        }
-    }
-    {
-        auto head = this->disk_buffer.buffer_head;
-        while (head) {
-            auto next = head->next;
-            free_buffer(head);
-            head = next;
-        }
-    }
+    this->flush_network_buffer();
+    this->flush_disk_buffer();
+
+    assert(!this->disk_buffer.buffer_head);
+    assert(!this->network_buffer.buffer_head);
 
     assert(!this->file.file_descriptor);
     assert(!this->file.currently_processing);