test_objagg: Test the correct variable

There is a typo here.  We intended to check "objagg2" but we instead
test "objagg" which is not an error pointer.

Fixes: 9069a3817d ("lib: objagg: implement optimization hints assembly and use hints for object creation")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

lib/test_objagg.c

@@ -952,8 +952,8 @@ static int test_hints_case(const struct hints_case *hints_case)
 	}
 
 	objagg2 = objagg_create(&delta_ops, hints, &world2);
-	if (IS_ERR(objagg))
-		return PTR_ERR(objagg);
+	if (IS_ERR(objagg2))
+		return PTR_ERR(objagg2);
 
 	for (i = 0; i < hints_case->key_ids_count; i++) {
 		objagg_obj = world_obj_get(&world2, objagg2,