Update redis-store.js

Author: wyattjoh

lib/redis-store.js

@@ -25,7 +25,7 @@ var RedisStore = function(options) {
         // in ioredis, every reply consists of an array [err, value].
         // We don't need the error here, and if we aren't dealing with an array,
         // nothing is changed.
-        replies = replies.map(function(val, index) {
+        replies = replies.map(function(val) {
           if (Array.isArray(val) && val.length >= 2) {
             return val[1];
           }