test: use mustNotCall() in test-fs-watch

Use common.mustNotCall() in test/sequential/test-fs-watch.js in
situations where the call to watch() is expected to throw.

PR-URL: #13595
Reviewed-By: Yuta Hiroto <hello@about-hiroppy.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

test/sequential/test-fs-watch.js

@@ -130,15 +130,15 @@ fs.watch(__filename, {persistent: false}, function() {
 // https://github.com/joyent/node/issues/6690
 let oldhandle;
 assert.throws(function() {
-  const w = fs.watch(__filename, common.noop);
+  const w = fs.watch(__filename, common.mustNotCall());
   oldhandle = w._handle;
   w._handle = { close: w._handle.close };
   w.close();
 }, /^TypeError: Illegal invocation$/);
 oldhandle.close(); // clean up
 
 assert.throws(function() {
-  const w = fs.watchFile(__filename, {persistent: false}, common.noop);
+  const w = fs.watchFile(__filename, {persistent: false}, common.mustNotCall());
   oldhandle = w._handle;
   w._handle = { stop: w._handle.stop };
   w.stop();