botan remove "invalid" return

botan/server/server.cpp

@@ -194,7 +194,6 @@ class Callbacks : public Botan::TLS::Callbacks {
             }
         }
         throw Botan::TLS::TLS_Exception(Botan::TLS::Alert::NO_APPLICATION_PROTOCOL, "INVALID ALPN");
-        return "invalid";
     }
 
     /*void tls_verify_cert_chain(