Fix memory leak in hash.update()

src/node_crypto.cc

@@ -2048,12 +2048,11 @@ class Hash : public ObjectWrap {
     return args.This();
   }
 
-  static Handle<Value>
+  static Handle<Value> HashUpdate(const Arguments& args) {
-  HashUpdate(const Arguments& args) {
-    Hash *hash = ObjectWrap::Unwrap<Hash>(args.This());
-
     HandleScope scope;
 
+    Hash *hash = ObjectWrap::Unwrap<Hash>(args.This());
+
     enum encoding enc = ParseEncoding(args[1]);
     ssize_t len = DecodeBytes(args[0], enc);
 
@@ -2068,6 +2067,8 @@ class Hash : public ObjectWrap {
 
     int r = hash->HashUpdate(buf, len);
 
+    delete[] buf;
+
     return args.This();
   }