Remove unneeded check

See commit 60dca2de, which converted preceeding
OSL_ENSURE into asserts - so nullptr is considered impossible here.

Change-Id: Ia6d8f226d94c84a66bad67ce1b5f702864d61fdc
Reviewed-on: https://gerrit.libreoffice.org/71475
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>

sw/source/core/layout/frmtool.cxx

@@ -1640,8 +1640,7 @@ void InsertCnt_( SwLayoutFrame *pLay, SwDoc *pDoc,
 
             //Close the section, where appropriate activate the surrounding
             //section again.
-            SwActualSection *pActualSectionUpper1 = pActualSection ? pActualSection->GetUpper() : nullptr;
-            pActualSection.reset(pActualSectionUpper1);
+            pActualSection.reset(pActualSection->GetUpper());
             pLay = pLay->FindSctFrame();
             if ( pActualSection )
             {