Update lib/buffer.js

Co-authored-by: Michaël Zasso <[email protected]>

Author: ronag

lib/buffer.js

@@ -476,7 +476,7 @@ function createFromString(string, ops, length = ops.byteLength(string)) {
 
 function fromString(string, encoding) {
   let ops;
-  if (!encoding || encoding === 'utf8') {
+  if (encoding === undefined || encoding === 'utf8') {
     ops = encodingOps.utf8;
   } else {
     ops = getEncodingOps(encoding);