test: simplify for loop in test-buffer-zero-fill-cli.js

PR-URL: #26799
Reviewed-By: Richard Lau <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>
Reviewed-By: Yongsheng Zhang <[email protected]>
Signed-off-by: Beth Griggs <[email protected]>

Author: juanarbol

test/parallel/test-buffer-zero-fill-cli.js

@@ -9,8 +9,8 @@ const SlowBuffer = require('buffer').SlowBuffer;
 const assert = require('assert');
 
 function isZeroFilled(buf) {
-  for (let n = 0; n < buf.length; n++)
-    if (buf[n] > 0) return false;
+  for (const n of buf)
+    if (n > 0) return false;
   return true;
 }