Fix crash & reduce nesting.

Change-Id: Ifbfe401cd69678c278394d190a37cc41a28d5c56

accessibility/source/standard/vclxaccessibletoolbox.cxx

@@ -484,12 +484,17 @@ void VCLXAccessibleToolBox::HandleSubToolBarEvent( const VclWindowEvent& rVclWin
 void VCLXAccessibleToolBox::ReleaseSubToolBox( ToolBox* _pSubToolBox )
 {
     ToolBox* pToolBox = static_cast< ToolBox* >( GetWindow() );
-    if ( pToolBox )
-    {
+    if ( !pToolBox )
+        return;
+
     sal_Int32 nIndex = pToolBox->GetItemPos( pToolBox->GetCurItemId() );
+    if ( nIndex == SAL_MAX_UINT16 )
+        return; // not found
+
     Reference< XAccessible > xItem = getAccessibleChild( nIndex );
-        if ( xItem.is() )
-        {
+    if ( !xItem.is() )
+        return;
+
     Reference< XAccessible > xChild = _pSubToolBox->GetAccessible();
     VCLXAccessibleToolBoxItem* pItem =
         static_cast< VCLXAccessibleToolBoxItem* >( xItem.get() );
@@ -498,8 +503,6 @@ void VCLXAccessibleToolBox::ReleaseSubToolBox( ToolBox* _pSubToolBox )
         pItem->SetChild( Reference< XAccessible >() );
         pItem->NotifyChildEvent( xChild, false );
     }
-        }
-    }
 }
 // -----------------------------------------------------------------------------
 void VCLXAccessibleToolBox::FillAccessibleStateSet( utl::AccessibleStateSetHelper& rStateSet )