clang-cl loplugin: xmlhelp

Change-Id: I66956b57b542bd6375ae113ff7cc8856fa6235cd
Reviewed-on: https://gerrit.libreoffice.org/29839
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>
diff --git a/xmlhelp/source/cxxhelp/provider/databases.cxx b/xmlhelp/source/cxxhelp/provider/databases.cxx
index 4371cfb..d0c51b2 100644
--- a/xmlhelp/source/cxxhelp/provider/databases.cxx
+++ b/xmlhelp/source/cxxhelp/provider/databases.cxx
@@ -980,13 +980,13 @@ void Databases::cascadingStylesheet( const OUString& Language,
                    {
                        aCSS = "highcontrastblack";
                        #ifdef _WIN32
                        HKEY hKey = NULL;
                        HKEY hKey = nullptr;
                        LONG lResult = RegOpenKeyExA( HKEY_CURRENT_USER, "Control Panel\\Accessibility\\HighContrast", 0, KEY_QUERY_VALUE, &hKey );
                        if ( ERROR_SUCCESS == lResult )
                        {
                            CHAR szBuffer[1024];
                            DWORD nSize = sizeof( szBuffer );
                            lResult = RegQueryValueExA( hKey, "High Contrast Scheme", NULL, NULL, (LPBYTE)szBuffer, &nSize );
                            lResult = RegQueryValueExA( hKey, "High Contrast Scheme", nullptr, nullptr, reinterpret_cast<LPBYTE>(szBuffer), &nSize );
                            if ( ERROR_SUCCESS == lResult && nSize > 0 )
                            {
                                szBuffer[nSize] = '\0';