Work around problem with boost::shared_array(NULL) ctor and Boost 1.53.0

...claiming

  template<class Y> boost::shared_array<T>::shared_array(Y*)

is not a viable option due to mismatched types 'Y*' and 'long int'

Change-Id: I8db321cd25cd73c84fa2a3124c9ec1018c131d5f

vcl/source/gdi/svgdata.cxx

@@ -166,7 +166,7 @@ SvgData::SvgData(const SvgDataArray& rSvgDataArray, sal_uInt32 nSvgDataArrayLeng
 
 //////////////////////////////////////////////////////////////////////////////
 SvgData::SvgData(const OUString& rPath):
-    maSvgDataArray(NULL),
+    maSvgDataArray(),
     mnSvgDataArrayLength(0),
     maPath(rPath),
     maRange(),