fix reference error issue #30

lib/zlib/inftrees.js

@@ -267,7 +267,7 @@ module.exports = function inflate_table(type, lens, lens_index, codes, table, ta
 
     /* go to next symbol, update count, len */
     sym++;
-    if (--(count[len]) === 0) {
+    if (--count[len] === 0) {
       if (len === max) { break; }
       len = lens[lens_index + work[sym]];
     }