video: backlight: tosa_lcd: drop check because i2c_unregister_device() is NULL safe
No need to check the argument of i2c_unregister_device() because the function itself does it. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org> Signed-off-by: Lee Jones <lee.jones@linaro.org>
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