This is a bugfix for the isdn4kernel.2.0.29 release.
It has to be aplied after the isdn4kernel.2.0.29.1 and isdn4kernel.2.0.29.2
bugfixes.
It'll be included in the isdn4kernel.2.0.29.3 bugfix, when
isdn4kernel.2.0.29.3 will be released.