This is a follow-up patch to my latest patch series.  It fixes the
problems and flaws Greg KH pointed out.

There was a typo in the Makefile, so the driver was never compiled.  But
I assumed that it built without errors.  Doh!

 - update the Technisat Skystar2 driver:
         - follow kernel coding rules, change comments
         - change function return values from u32 to int where possible
         - make all functions static
         - comment out unused functions
         - fix return values of functions to follow kernel rules
         - removed bogus delay, read and write functions