fix assert

Event/TrackEvent/include/Event/SOATrackConversion.h

@@ -172,7 +172,7 @@ namespace LHCb::Event::conversion {
       outTrack.template field<v3::Tag::LHCbIDs>( numVPLHCbIDs + numUTLHCbIDs + numFTLHCbIDs ).set( id.lhcbID() );
     }
 
-    assert( numVPLHCbIDs + numUTLHCbIDs + numFTLHCbIDs == track.lhcbIDs() );
+    assert( numVPLHCbIDs + numUTLHCbIDs + numFTLHCbIDs == static_cast<int>( track.lhcbIDs().size() ) );
 
     outTrack.template field<v3::Tag::numVPLHCbIDs>().set( numVPLHCbIDs );
     outTrack.template field<v3::Tag::numUTLHCbIDs>().set( numUTLHCbIDs );