Fix for compilation error on 2.6.34

[tadzik]

Hello,
Here's my quick and dirty fix for compilation issue on 2.6.34. backlight_device_register() needs some optional argument, luckily passing NULL works fine (at least for me). Patch here

EDIT: New patch here, done more-less the right way (almost copied from some grepped out code from the linux kernel)

EDIT2: Since author does not seem to give attention to the case and I've alredy seen people who need this, I created a fork (http://github.com/tadzik/lenovo-sl-laptop). I'm not really into kernel module development, but I'll try to take care of it.

[xuzhen]

here is a better patch: http://wklej.org/id/375151/
works with kernel<2.6.34 and >=2.6.34

[tadzik]

FYI, applied in my fork.