Resolves: tdf#91695 partially Revert "crash on layout of novell622972-2.html"

This reverts commit 9857c639.

Change-Id: Id47e982eb346c092991f07964c0146daefccb031

sw/source/core/layout/layact.cxx

@@ -1239,12 +1239,7 @@ bool SwLayAction::FormatLayout( SwLayoutFrm *pLay, bool bAddRect )
             aOldRect = static_cast<SwPageFrm*>(pLay)->GetBoundRect();
         }
 
-        {
-            //JoinLock pParent for the lifetime of the Calc call to avoid
-            //SwSectionFrm::MergeNext removing the pLay we're trying to Format
-            FlowFrmJoinLockGuard aJoinGuard(pLay);
-            pLay->Calc();
-        }
+        pLay->Calc();
 
         if ( aOldFrame != pLay->Frm() )
             bChanged = true;