fix output of object command

We're expecting a pointer, not a value. This works in daemon mode but not in
offline mode.

fixes #5458

License: MIT
Signed-off-by: Steven Allen <steven@stebalien.com>

core/commands/object/object.go

@@ -160,7 +160,7 @@ multihash.
 			}
 		}
 
-		out := Object{
+		out := &Object{
 			Hash:  rp.Cid().String(),
 			Links: outLinks,
 		}