Fixed memory access bug when cleaning expired old maps.
Fixed memory access bug when cleaning expired old maps.

libmapper/libmapper,radarsat1/libmapper,libmapper/libmapper,malloch/libmapper,radarsat1/libmapper,libmapper/libmapper,radarsat1/libmapper,libmapper/libmapper,radarsat1/libmapper,radarsat1/libmapper,malloch/libmapper,malloch/libmapper,malloch/libmapper,malloch/libmapper,libmapper/libmapper,malloch/libmapper,libmapper/libmapper