RedisStorage: use %d instead of %n in format string

ffstatus/redisstorage.py

@@ -17,11 +17,11 @@ class RedisStorage(BaseStorage):
                  redis_host='127.0.0.1', redis_port=6379, redis_password=None):
         self.logger = logging.getLogger('RedisStorage')
 
-        self.logger.debug('Connecting to REDIS database at %s on port %n.',
+        self.logger.debug('Connecting to REDIS database at %s on port %d.',
                           redis_host, redis_port)
         self.db = redis.StrictRedis(host=redis_host, port=redis_port,
                                     password=redis_password)
-        self.logger.info('Connected to REDIS database with %n entries.',
+        self.logger.info('Connected to REDIS database with %d entries.',
                          self.db.dbsize())
 
     def save(self):