correct the retry_config

Author: esrakartalOpt

lib/optimizely/cmab/cmab_client.rb

@@ -151,15 +151,15 @@ def _do_fetch_with_retry(url, request_body, retry_config, timeout)
       #   The variation ID from the response.
 
       attempt = 0
-      backoff = @retry_config.retry_delay
+      backoff = retry_config.retry_delay
       begin
         _do_fetch(url, request_body, timeout)
       rescue => e
-        if attempt < @retry_config.max_retries
+        if attempt < retry_config.max_retries
           @logger.log(Logger::INFO, "Retrying CMAB request (attempt #{attempt + 1}) after #{backoff} seconds...")
           Kernel.sleep(backoff)
           attempt += 1
-          backoff = [backoff * @retry_config.backoff_multiplier, @retry_config.max_backoff].min
+          backoff = [backoff * retry_config.backoff_multiplier, retry_config.max_backoff].min
           retry
         else
           @logger.log(Logger::ERROR, "Max retries exceeded for CMAB request: #{e.message}")