test: add mustCall in test-fs-readfilesync-pipe-large.js

PR-URL: #27458
Reviewed-By: Weijia Wang <starkwang@126.com>
Reviewed-By: Yorkie Liu <yorkiefixer@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Anto Aravinth <anto.aravinth.cse@gmail.com>
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>

test/parallel/test-fs-readfilesync-pipe-large.js

@@ -26,12 +26,16 @@ const exec = require('child_process').exec;
 const f = JSON.stringify(__filename);
 const node = JSON.stringify(process.execPath);
 const cmd = `cat ${filename} | ${node} ${f} child`;
-exec(cmd, { maxBuffer: 1000000 }, function(err, stdout, stderr) {
-  assert.ifError(err);
-  assert.strictEqual(stdout, dataExpected);
-  assert.strictEqual(stderr, '');
-  console.log('ok');
-});
+exec(
+  cmd,
+  { maxBuffer: 1000000 },
+  common.mustCall(function(err, stdout, stderr) {
+    assert.ifError(err);
+    assert.strictEqual(stdout, dataExpected);
+    assert.strictEqual(stderr, '');
+    console.log('ok');
+  })
+);
 
 process.on('exit', function() {
   fs.unlinkSync(filename);