loplugin:useuniqueptr in SmDocShell

Change-Id: I1183edd427da0ee31547ebdad572ec5cac3fb33f
Reviewed-on: https://gerrit.libreoffice.org/51670Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

starmath/inc/document.hxx

@@ -91,7 +91,7 @@ class SM_DLLPUBLIC SmDocShell : public SfxObjectShell, public SfxListener
     SvtLinguOptions     maLinguOptions;
     std::unique_ptr<SmTableNode> mpTree;
     SfxItemPool        *mpEditEngineItemPool;
-    EditEngine         *mpEditEngine;
+    std::unique_ptr<EditEngine> mpEditEngine;
     VclPtr<SfxPrinter>  mpPrinter;       //q.v. comment to SmPrinter Access!
     VclPtr<Printer>     mpTmpPrinter;    //ditto
     sal_uInt16          mnModifyCount;

starmath/source/document.cxx

@@ -331,7 +331,7 @@ EditEngine& SmDocShell::GetEditEngine()
 
         SetEditEngineDefaultFonts(*mpEditEngineItemPool, maLinguOptions);
 
-        mpEditEngine = new EditEngine( mpEditEngineItemPool );
+        mpEditEngine.reset( new EditEngine( mpEditEngineItemPool ) );
 
         mpEditEngine->SetAddExtLeading(true);
 
@@ -639,7 +639,7 @@ SmDocShell::~SmDocShell()
     EndListening(*pp->GetConfig());
 
     mpCursor.reset();
-    delete mpEditEngine;
+    mpEditEngine.reset();
     SfxItemPool::Free(mpEditEngineItemPool);
     mpPrinter.disposeAndClear();
 }