Use statistics locks properly

daemon/graphite.c

@@ -350,7 +350,7 @@ void graphite_loop_run(endpoint_t *graphite_ep, int seconds) {
 			connection_state = STATE_DISCONNECTED;
 		}
 
-		copy_with_lock(&rtpe_totalstats_lastinterval, &graphite_stats, &rtpe_totalstats_lastinterval.total_average_lock);
+		copy_with_lock(&rtpe_totalstats_lastinterval, &graphite_stats, &rtpe_totalstats_lastinterval_lock);
 	}
 
 }

daemon/statistics.c

@@ -227,6 +227,10 @@ void statistics_init() {
 
 	mutex_init(&rtpe_totalstats_lastinterval_lock);
 
+	mutex_init(&rtpe_totalstats_interval.offer.lock);
+	mutex_init(&rtpe_totalstats_interval.answer.lock);
+	mutex_init(&rtpe_totalstats_interval.delete.lock);
+
 	mutex_init(&rtpe_totalstats_interval.offers_ps.lock);
 	mutex_init(&rtpe_totalstats_interval.answers_ps.lock);
 	mutex_init(&rtpe_totalstats_interval.deletes_ps.lock);