In Raptor RDF Syntax Library through 2.0.16, there is an integer underflow when normalizing a URI with the turtle parser in raptor_uri_normalize_path().Referenceshttps://github.com/pedrib/PoC/blob/master/fuzzing/raptor-fuzz.mdhttps://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1067896https://github.com/dajobe/raptor/issues/70
