Remove useless while loop in privateKeyNegate

Author: fanatid

lib/js/index.js

@@ -21,17 +21,9 @@ exports.privateKeyExport = function (privateKey, compressed) {
 
 exports.privateKeyNegate = function (privateKey) {
   var bn = BN.fromBuffer(privateKey)
+  if (bn.isZero()) return Buffer.alloc(32)
 
-  if (bn.isZero()) {
-    return Buffer.alloc(32)
-  }
-
-  if (bn.ucmp(BN.n) !== 0) {
-    while (bn.isOverflow()) {
-      bn.isub(BN.n)
-    }
-  }
-
+  if (bn.ucmp(BN.n) > 0) bn.isub(BN.n)
   return BN.n.sub(bn).toBuffer()
 }