coverity#1213307 Dereference before null check

I can see nowhere that m_pHScrollbar or m_pVScrollbar are
set to NULL, deleted yes in the dtor, but nowhere NULLed.

Change-Id: I3012be6de1117757237884deebacc9e0e29dc7a7

sw/source/uibase/uiview/pview.cxx

@@ -1244,7 +1244,7 @@ int SwPagePreview::_CreateScrollbar( bool bHori )
     Window *pMDI = &GetViewFrame()->GetWindow();
     SwScrollbar** ppScrollbar = bHori ? &pHScrollbar : &pVScrollbar;
 
-    OSL_ENSURE( !*ppScrollbar, "check beforehand!" );
+    assert(!*ppScrollbar); //check beforehand!
 
     *ppScrollbar = new SwScrollbar( pMDI, bHori );
 

sw/source/uibase/uiview/viewmdi.cxx

@@ -290,7 +290,7 @@ int SwView::_CreateScrollbar( bool bHori )
     Window *pMDI = &GetViewFrame()->GetWindow();
     SwScrollbar** ppScrollbar = bHori ? &m_pHScrollbar : &m_pVScrollbar;
 
-    OSL_ENSURE( !*ppScrollbar, "check beforehand!" );
+    assert(!*ppScrollbar); //check beforehand!
 
     *ppScrollbar = new SwScrollbar( pMDI, bHori );
     UpdateScrollbars();
@@ -305,9 +305,7 @@ int SwView::_CreateScrollbar( bool bHori )
     if(GetWindow())
         InvalidateBorder();
 
-    // The scrollbar has to be tested again, as in InvalidateBorder possibly
-    // the scrollbar has been deleted.
-    if ( !m_bShowAtResize && (*ppScrollbar))
+    if (!m_bShowAtResize)
         (*ppScrollbar)->ExtendedShow();
 
     return 1;