Update RedisNativeClient_Utils.cs

Dublicate throw.
throw throw new RedisResponseException() in result.

Author: giardo911

src/ServiceStack.Redis/RedisNativeClient_Utils.cs

@@ -302,7 +302,7 @@ private RedisResponseException CreateResponseError(string error)
 
             var throwEx = new RedisResponseException(error);
             log.Error(error);
-            throw throwEx;
+            return throwEx;
         }
 
         private RedisRetryableException CreateNoMoreDataError()