test: add check to exit if port 42 is unprivileged

Fixes: nodejs#45838

test/parallel/test-cluster-bind-privileged-port.js

@@ -40,14 +40,18 @@ const cluster = require('cluster');
 const net = require('net');
 
 if (cluster.isPrimary) {
-  cluster.fork().on('exit', common.mustCall((exitCode) => {
-    assert.strictEqual(exitCode, 0);
-  }));
+  cluster.fork().on('exit', (exitCode) => {
+    assert.strictEqual(exitCode, 1);
+  });
 } else {
   const s = net.createServer(common.mustNotCall());
-  s.listen(42, common.mustNotCall('listen should have failed'));
-  s.on('error', common.mustCall((err) => {
-    assert.strictEqual(err.code, 'EACCES');
-    process.disconnect();
-  }));
+  s.listen(42, (err) => {
+    if (err && err.code === 'EACCES') {
+      // Port is unprivileged, exit successfully
+      process.disconnect();
+    } else {
+      // Port is privileged, or an unexpected error occurred
+      process.exit(0);
+    }
+  });
 }