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backlight: lm3630a: Fix return code of .update_status() callback
[ Upstream commit b9481a6 ] According to <linux/backlight.h> .update_status() is supposed to return 0 on success and a negative error code otherwise. Adapt lm3630a_bank_a_update_status() and lm3630a_bank_b_update_status() to actually do it. While touching that also add the error code to the failure message. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org> Signed-off-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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