Fix Coverity Scan #1491937

src/loop.c

@@ -157,7 +157,7 @@ static void queue_plugin_msgs(void)
 void loop__update_next_event(time_t new_ms)
 {
 	if(new_ms > 0 && new_ms < db.next_event_ms){
-		db.next_event_ms = (int)new_ms;
+		db.next_event_ms = new_ms;
 	}
 }
 

src/mosquitto_broker_internal.h

@@ -482,7 +482,7 @@ struct mosquitto_db{
 	time_t now_s; /* Monotonic clock, where possible */
 	time_t now_real_s; /* Read clock, for measuring session/message expiry */
 	uint64_t node_id; /* for unique db ids */
-	int next_event_ms; /* for mux timeout */
+	time_t next_event_ms; /* for mux timeout */
 	int msg_store_count;
 	unsigned long msg_store_bytes;
 	char *config_file;