The rate_moving_average is used by timed_rate_moving_average to return
its internal values.
If there are no timed event, the mean_rate is not propertly initilized.
To solve that the mean_rate is now initilized to 0 in the structure
definition.
Refs #1306
Signed-off-by: Amnon Heiman <amnon@scylladb.com>
Message-Id: <1465231006-7081-1-git-send-email-amnon@scylladb.com>