coverity#1132662 Dereference after null check

Change-Id: Iaccf8bb7903702d2bed3c4fc2195172e18ead6c7
diff --git a/accessibility/source/standard/vclxaccessiblelist.cxx b/accessibility/source/standard/vclxaccessiblelist.cxx
index f998904..6d22816 100644
--- a/accessibility/source/standard/vclxaccessiblelist.cxx
+++ b/accessibility/source/standard/vclxaccessiblelist.cxx
@@ -281,7 +281,7 @@ void VCLXAccessibleList::UpdateSelection_Impl_Acc(bool b_IsDropDownList)
    {
        //VCLXAccessibleDropdownListBox
        //when in list is dropped down, xText = NULL
        if (m_pListBoxHelper->IsInDropDown())
        if (m_pListBoxHelper && m_pListBoxHelper->IsInDropDown())
        {
            if ( aNewValue.hasValue() || aOldValue.hasValue() )
            {