loplugin:useuniqueptr in VectorGraphicData

Change-Id: I73badcdf544b1c3508c9eb9e489b049a9fa12928

include/vcl/vectorgraphicdata.hxx

@@ -26,6 +26,7 @@
 #include <vcl/wmfexternal.hxx>
 #include <rtl/ustring.hxx>
 #include <deque>
+#include <memory>
 
 
 typedef css::uno::Sequence<sal_Int8> VectorGraphicDataArray;
@@ -65,7 +66,7 @@ private:
     VectorGraphicDataType       meVectorGraphicDataType;
 
     // extra:
-    WmfExternal*         mpExternalHeader;
+    std::unique_ptr<WmfExternal> mpExternalHeader;
 
     // on demand creators
     void ensureReplacement();

vcl/source/gdi/vectorgraphicdata.cxx

@@ -129,7 +129,7 @@ void VectorGraphicData::setWmfExternalHeader(const WmfExternal& aExtHeader)
 {
     if (!mpExternalHeader)
     {
-        mpExternalHeader = new WmfExternal;
+        mpExternalHeader.reset( new WmfExternal );
     }
 
     *mpExternalHeader = aExtHeader;
@@ -269,10 +269,6 @@ VectorGraphicData::VectorGraphicData(
 
 VectorGraphicData::~VectorGraphicData()
 {
-    if (mpExternalHeader)
-    {
-        delete mpExternalHeader;
-    };
 }
 
 const basegfx::B2DRange& VectorGraphicData::getRange() const