Add error value for non-property test

tests/zfs-tests/tests/functional/channel_program/synctask_core/tst.set_props.zcp

@@ -48,7 +48,7 @@ pos_props["a:prop"] = {"hello"}
 
 -- For neg_props, an optional expected error value can be added after the
 -- property value as seen below.
-neg_props["notaproperty"] = {"hello"}
+neg_props["notaproperty"] = {"hello", EINVAL}
 neg_props["a:very.long.property.value"] = { largepropv, E2BIG }
 neg_props[largepropnamev] = {"greetings", ENAMETOOLONG }