tdf#107792 vcl/win: simplify WinSalVirtualDevice::~WinSalVirtualDevice()

Change-Id: I61c2ee1e8363a022239d5572e3506df9da0d5e1d
Reviewed-on: https://gerrit.libreoffice.org/67433Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>
Tested-by: Jenkins

vcl/win/gdi/salvd.cxx

@@ -179,9 +179,6 @@ WinSalVirtualDevice::~WinSalVirtualDevice()
         SelectBitmap( mpGraphics->getHDC(), mhDefBmp );
     if( !mbForeignDC )
         DeleteDC( mpGraphics->getHDC() );
-
-    mhBmp.reset();
-    mpGraphics.reset();
 }
 
 SalGraphics* WinSalVirtualDevice::AcquireGraphics()