LOK: desktop: use correct size when initializing LibreOfficeKitDocument

Change-Id: I0aecc459cf448c03dd8c17a486cc66f541f6868d
Reviewed-on: https://gerrit.libreoffice.org/63322
Tested-by: Jenkins
Reviewed-by: Jan Holesovsky <kendy@collabora.com>

desktop/source/lib/init.cxx

@@ -714,7 +714,7 @@ LibLODocument_Impl::LibLODocument_Impl(const uno::Reference <css::lang::XCompone
     {
         m_pDocumentClass.reset(new LibreOfficeKitDocumentClass);
 
-        m_pDocumentClass->nSize = sizeof(LibreOfficeKitDocument);
+        m_pDocumentClass->nSize = sizeof(LibreOfficeKitDocumentClass);
 
         m_pDocumentClass->destroy = doc_destroy;
         m_pDocumentClass->saveAs = doc_saveAs;