[PATCH] fix sonypi/spicctrl set/get brightness support

[Danny Kukawka]

Hi, 

this patch fixes the get/set LCD brightness code for machines which supported 
by the sonypi kernel module and set/get py spicctrl. I added also some checks 
and a new error message if spicctrl is not available/executable.

Danny

 hal-system-lcd-get-brightness-linux |   20 +++++++++++++-------
 hal-system-lcd-set-brightness-linux |   13 +++++++++----
 2 files changed, 22 insertions(+), 11 deletions(-)
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