quoted

I got the impression that the exception handling  was incomplete in the
implementation of the function "gigaset_initcs".

That impression is wrong. Careful reading of the code will confirm that.

* Is it still correct nowadays that the function "gigaset_initcs" did not
  call the function "kfree" after a later function call failed?

* Do you expect that allocated memory will be automatically reclaimed
  after it would return a null pointer?

Regards,
Markus