tdf#120703 (PVS): V519 variable is assigned values twice successively

V519 The 'xFontCharMap' variable is assigned values twice successively.
     Perhaps this is a mistake. Check lines: 1673, 1674.

Change-Id: I008c268bd2440e489d4cd50f94b4f04129589448
Reviewed-on: https://gerrit.libreoffice.org/62408Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>
Tested-by: Mike Kaganski <mike.kaganski@collabora.com>

vcl/win/gdi/salfont.cxx

@@ -1658,8 +1658,6 @@ bool WinSalGraphics::CreateFontSubset( const OUString& rToFile,
     if( aRawCffData.get() )
     {
         pWinFontData->UpdateFromHDC( getHDC() );
-        FontCharMapRef xFontCharMap = pWinFontData->GetFontCharMap();
-        xFontCharMap = nullptr;
 
         // provide a font subset from the CFF-table
         FILE* pOutFile = fopen( aToFile.getStr(), "wb" );