Fix using uninitialized value (missing return in outbox_envelope_new)

src/model/ap/outbox_envelope.c

@@ -35,6 +35,8 @@ struct outbox_envelope* outbox_envelope_new()
 	env = malloc(sizeof(*env));
 	if( !env ) { return NULL; }
 	memset(env,0,sizeof(*env));
+
+	return env;
 }
 void outbox_envelope_free( struct outbox_envelope* env )
 {