Fix possible memory leak with bridges and SSL.

Fix possible memory leak if bridge using SSL attempts to connect to a
host that is not up.

Thanks to Ed Morris.

ChangeLog.txt

@@ -1,3 +1,7 @@
+Broker:
+- Fix possible memory leak if bridge using SSL attempts to connect to a
+  host that is not up.
+
 Clients:
 - "mosquitto_pub -l" now no longer limited to 1024 byte lines. Closes #478917.
 

src/bridge.c

@@ -211,6 +211,7 @@ int mqtt3_bridge_connect(struct mosquitto_db *db, struct mosquitto *context)
 	rc = _mosquitto_socket_connect(context, context->bridge->addresses[context->bridge->cur_address].address, context->bridge->addresses[context->bridge->cur_address].port, NULL, false);
 	if(rc > 0 ){
 		if(rc == MOSQ_ERR_TLS){
+			_mosquitto_socket_close(db, context);
 			return rc; /* Error already printed */
 		}else if(rc == MOSQ_ERR_ERRNO){
 			_mosquitto_log_printf(NULL, MOSQ_LOG_ERR, "Error creating bridge: %s.", strerror(errno));