backlight: Fix incr/decr with percent value of 0
This now does nothing instead of incr/decr by 10%
MFC After: 3 days
PR: 253736
(cherry picked from commit 3b005d51bd0fe4d8d19fb2df4d470b6e8baebf16)
backlight: Fix incr/decr with percent value of 0 Tags None Referenced Files None Subscribers None
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