Fix wrong format specifiers in the samples.

Use "%ld" instead of "%d" to format long values, using "%d" results in an
assert failure under LP64 systems as int and long have different sizes there.

Closes #14311.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@71469 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/sockets/client.cpp

@@ -612,9 +612,9 @@ void MyFrame::OnTestURL(wxCommandEvent& WXUNUSED(event))
     }
 
     // Print the contents type and file size
-    wxLogMessage("Contents type: %s\nFile size: %i\nStarting to download...",
+    wxLogMessage("Contents type: %s\nFile size: %lu\nStarting to download...",
                  url.GetProtocol().GetContentType(),
-                 data->GetSize());
+                 static_cast<unsigned long>( data->GetSize() ));
 
     // Get the data
     wxStringOutputStream sout;