This assertion fails many times & is very noisy.

The fact that there is a if statement to check for the NULL pointer
suggests that the pointer can be NULL sometimes.  Let's remove this
OSL_ENSURE.

sc/source/core/data/bcaslot.cxx

@@ -590,7 +590,6 @@ void ScBroadcastAreaSlotMachine::EndListeningArea( const ScRange& rRange,
 {
     if ( rRange == BCA_LISTEN_ALWAYS  )
     {
-        OSL_ENSURE( pBCAlways, "ScBroadcastAreaSlotMachine::EndListeningArea: BCA_LISTEN_ALWAYS but none established");
         if ( pBCAlways )
         {
             pListener->EndListening( *pBCAlways);