Fix return type for instance bsearch.
Fix return type for instance bsearch.

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