Note that since filters run in a different thread, there is a race
condition where it is possible that the filter will be running even
after calling g_dbus_connection_remove_filter(), so you cannot just
free data that the filter might be using. Instead, you should pass
a #GDestroyNotify to g_dbus_connection_add_filter(), which will be
called when it is guaranteed that the data is no longer needed.
Removes a filter.
Note that since filters run in a different thread, there is a race condition where it is possible that the filter will be running even after calling g_dbus_connection_remove_filter(), so you cannot just free data that the filter might be using. Instead, you should pass a #GDestroyNotify to g_dbus_connection_add_filter(), which will be called when it is guaranteed that the data is no longer needed.