[465438] Fix incorrect behaviour for autosave_interval.

Thanks to Jaime Yu.

Bug: https://bugs.eclipse.org/bugs/show_bug.cgi?id=465438

ChangeLog.txt

@@ -1,6 +1,8 @@
 Broker:
 - Fix incorrect bridge notification on initial connection. Closes #467096.
 - Build fixes for OpenBSD.
+- Fix incorrect behaviour for autosave_interval, most noticable for
+  autosave_interval=1. Closes #465438.
 
 Client library:
 - Add missing error strings to mosquitto_strerror.

src/loop.c

@@ -331,7 +331,7 @@ int mosquitto_main_loop(struct mosquitto_db *db, mosq_sock_t *listensock, int li
 #ifdef WITH_PERSISTENCE
 		if(db->config->persistence && db->config->autosave_interval){
 			if(db->config->autosave_on_changes){
-				if(db->persistence_changes > db->config->autosave_interval){
+				if(db->persistence_changes >= db->config->autosave_interval){
 					mqtt3_db_backup(db, false);
 					db->persistence_changes = 0;
 				}