Fix `bind_interface` not working for the default listener.

Closes #1533. Thanks to Markus Gothe.

ChangeLog.txt

@@ -9,6 +9,7 @@ Broker:
   listening socket, by calling freeaddrinfo. Closes #1565.
 - Fix config->user not being freed on exit. Closes #1564.
 - Fix trailing whitespace not being trimmed on acl users. Closes #1539.
+- Fix `bind_interface` not working for the default listener. Closes #1533.
 
 Library:
 - Set minimum keepalive argument to `mosquitto_connect*()` to be 5 seconds.

src/conf.c

@@ -446,6 +446,7 @@ int config__parse_args(struct mosquitto_db *db, struct mosquitto__config *config
 	}
 
 	if(config->listener_count == 0
+			|| config->default_listener.bind_interface
 #ifdef WITH_TLS
 			|| config->default_listener.cafile
 			|| config->default_listener.capath
@@ -499,6 +500,7 @@ int config__parse_args(struct mosquitto_db *db, struct mosquitto__config *config
 		}else{
 			config->listeners[config->listener_count-1].mount_point = NULL;
 		}
+		config->listeners[config->listener_count-1].bind_interface = config->default_listener.bind_interface;
 		config->listeners[config->listener_count-1].max_connections = config->default_listener.max_connections;
 		config->listeners[config->listener_count-1].protocol = config->default_listener.protocol;
 		config->listeners[config->listener_count-1].socket_domain = config->default_listener.socket_domain;