backlight: lm3639: Remove unnecessary return statements
backlight: lm3639: Remove unnecessary return statements

Fixed the following checkpatch warning.

  WARNING: void function return statements are not generally useful

Signed-off-by: Jingoo Han <fc379137a64feb86ce38ec5811a14280acc1ccfc@samsung.com>
Signed-off-by: Lee Jones <630e34333487a351a857f6b705e04d30b37c1629@linaro.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs