namespaces: fix yet another memory leak
namespaces: fix yet another memory leak

note: cb:set() is not appropiate here (needs to be reentrant)

gallenmu/MoonGen,kidaa/MoonGen,emmericp/MoonGen,NetronomeMoongen/MoonGen,slyon/MoonGen,schoenb/MoonGen,dschoeffm/MoonGen,duk3luk3/MoonGen,gallenmu/MoonGen,wenhuizhang/MoonGen,werpat/MoonGen,gallenmu/MoonGen,gallenmu/MoonGen,werpat/MoonGen,dschoeffm/MoonGen,scholzd/MoonGen,kidaa/MoonGen,gallenmu/MoonGen,atheurer/MoonGen,emmericp/MoonGen,schoenb/MoonGen,emmericp/MoonGen,gallenmu/MoonGen,NetronomeMoongen/MoonGen,kidaa/MoonGen,scholzd/MoonGen,bmichalo/MoonGen,gallenmu/MoonGen,gallenmu/MoonGen,werpat/MoonGen,slyon/MoonGen,slyon/MoonGen,bmichalo/MoonGen,wenhuizhang/MoonGen,duk3luk3/MoonGen,duk3luk3/MoonGen,bmichalo/MoonGen,NetronomeMoongen/MoonGen,slyon/MoonGen,wenhuizhang/MoonGen,schoenb/MoonGen,dschoeffm/MoonGen,scholzd/MoonGen,bmichalo/MoonGen,atheurer/MoonGen,atheurer/MoonGen