simplify Buffer.isBuffer check

diff --git a/index.js b/index.js
index 9526e880f32132d05a281d4d2c1363151fb743e5..b3e3d4123da48d211735097044886d5877a1f81c 100644 (file)
--- a/index.js
+++ b/index.js
@@ -126,7 +126,7 @@ Buffer.isEncoding = function (encoding) {
 }
 
 Buffer.isBuffer = function (b) {
-  return !!(b !== null && b !== undefined && b._isBuffer)
+  return !!(b != null && b._isBuffer)
 }
 
 Buffer.byteLength = function (str, encoding) {