fixup! fs: fix flag and mode validation

Author: jasnell

test/parallel/test-fs-lchmod.js

@@ -46,7 +46,7 @@ assert.throws(() => fs.lchmod(f, {}), { code: 'ERR_INVALID_CALLBACK' });
   assert.throws(() => fs.lchmodSync(f, input), errObj);
 });
 
-assert.throws(() => fs.lchmod(f, '123x'), {
+assert.throws(() => fs.lchmod(f, '123x', common.mustNotCall()), {
   code: 'ERR_INVALID_ARG_VALUE'
 });
 assert.throws(() => fs.lchmodSync(f, '123x'), {