test: throw check in test-zlib-write-after-close

PR-URL: https://github.com/nodejs/node/pull/11482
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Yuta Hiroto <hello@about-hiroppy.com>

test/parallel/test-zlib-write-after-close.js

@@ -6,7 +6,5 @@ var zlib = require('zlib');
 zlib.gzip('hello', common.mustCall(function(err, out) {
   var unzip = zlib.createGunzip();
   unzip.close(common.mustCall(function() {}));
-  assert.throws(function() {
+  assert.throws(() => unzip.write(out), /^Error: zlib binding closed$/);
-    unzip.write(out);
-  });
 }));