Fixed resource leak on ubus_init failure.

When ubus_add_object fails, the ubus_connect object is not freed, so the
connection leaks. Add ubus_destroy to free the connection object.

Signed-off-by: Oldřich Jedlička <oldium.pro@gmail.com>

src/ubus.c

@@ -102,6 +102,7 @@ void ubus_init()
           my_syslog(LOG_ERR, _("Cannot add object to UBus: %s"), ubus_strerror(ret));
           error_logged = 1;
         }
+      ubus_destroy(ubus);
       return;
     }