test: test failed with_mfa

apps/emqx/src/emqx_vm.erl

@@ -399,7 +399,6 @@ compat_windows(Fun) when is_function(Fun, 0) ->
             0.0
     end;
 compat_windows(Fun) ->
-    ?SLOG(warning, "Invalid function: ~p", [Fun]),
     error({badarg, Fun}).
 
 load(Avg) ->

apps/emqx_conf/test/emqx_conf_schema_tests.erl

@@ -133,7 +133,8 @@ log.file_handlers {
         single_line => true,
         template => ["[", level, "] ", msg, "\n"],
         time_offset => TimeOffset,
-        timestamp_format => auto
+        timestamp_format => auto,
+        with_mfa => false
     }}
 ).