backlight: ld9040: remove unnecessary NULL deference check

Removee unnecessary NULL deference check, because it was already checked
in ld9040_probe().  Also, power_is_on is replaced with
ld9040_power_is_on().

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 file changed