Fix #31556: cycles object info random value was not properly randomized for

dupligroups.

intern/cycles/render/object.h

@@ -41,7 +41,7 @@ public:
 	Transform tfm;
 	BoundBox bounds;
 	ustring name;
-	int instance_id;
+	int random_id;
 	int pass_id;
 	vector<ParamValue> attributes;
 	uint visibility;