Fix brain-fart getting string length in replace_expression_string().
Fix brain-fart getting string length in replace_expression_string().

johnty/libmapper,malloch/libmapper,radarsat1/libmapper,libmapper/libmapper,davidhernon/libmapper-admin2,johnty/libmapper,libmapper/libmapper,radarsat1/libmapper,johnty/libmapper,libmapper/libmapper,malloch/libmapper,malloch/libmapper,libmapper/libmapper,libmapper/libmapper,davidhernon/libmapper,davidhernon/libmapper-admin2,malloch/libmapper,johnty/libmapper,davidhernon/libmapper,davidhernon/libmapper-admin2,malloch/libmapper,radarsat1/libmapper,davidhernon/libmapper,malloch/libmapper,davidhernon/libmapper,davidhernon/libmapper-admin2,davidhernon/libmapper-admin2,davidhernon/libmapper,radarsat1/libmapper,radarsat1/libmapper,johnty/libmapper,libmapper/libmapper