revert listLen caching

Author: mertcanaltin

lib/buffer.js

@@ -608,13 +608,12 @@ Buffer[kIsEncodingSymbol] = Buffer.isEncoding;
 Buffer.concat = function concat(list, length) {
   validateArray(list, 'list');
 
-  const listLen = list.length;
-  if (listLen === 0)
+  if (list.length === 0)
     return new FastBuffer();
 
   if (length === undefined) {
     length = 0;
-    for (let i = 0; i < listLen; i++) {
+    for (let i = 0; i < list.length; i++) {
       const buf = list[i];
       if (!isUint8Array(buf)) {
         // TODO(BridgeAR): This should not be of type ERR_INVALID_ARG_TYPE.
@@ -627,7 +626,7 @@ Buffer.concat = function concat(list, length) {
 
     const buffer = allocate(length);
     let pos = 0;
-    for (let i = 0; i < listLen; i++) {
+    for (let i = 0; i < list.length; i++) {
       const buf = list[i];
       TypedArrayPrototypeSet(buffer, buf, pos);
       pos += buf.length;
@@ -642,7 +641,7 @@ Buffer.concat = function concat(list, length) {
   validateOffset(length, 'length');
   const buffer = allocate(length);
   let pos = 0;
-  for (let i = 0; i < listLen; i++) {
+  for (let i = 0; i < list.length; i++) {
     const buf = list[i];
     if (!isUint8Array(buf)) {
       // TODO(BridgeAR): This should not be of type ERR_INVALID_ARG_TYPE.