Fix mem leak.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@38957 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/dirdlg.cpp

@@ -73,9 +73,12 @@ static void gtk_filedialog_ok_callback(GtkWidget *widget, wxDirDialog *dialog)
             wxMessageDialog dlg(dialog, msg, _("Confirm"),
                                wxYES_NO | wxICON_QUESTION);
             if (dlg.ShowModal() != wxID_YES)
+            {
+                g_free(filename);
                 return;
             }
         }
+    }
 
     // change to the directory where the user went if asked
     if (style & wxCHANGE_DIR)