intermediate _disposing call doesn't exist anymore

Change-Id: Ifcc5142eaebae06634e1530abb1361cc123117f5
Reviewed-on: https://gerrit.libreoffice.org/62189
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

extensions/source/bibliography/loadlisteneradapter.cxx

@@ -94,16 +94,14 @@ namespace bib
 
     void SAL_CALL OComponentAdapterBase::disposing( const EventObject& )
     {
-        if ( m_pListener )
+        if (m_pListener)
         {
             // disconnect the listener
-            if ( m_pListener )  // may have been reset whilest calling into _disposing
-                m_pListener->setAdapter( nullptr );
+            m_pListener->setAdapter( nullptr );
+            m_pListener = nullptr;
         }
 
-        m_pListener = nullptr;
         m_bListening = false;
-
         m_xComponent = nullptr;
     }