[PATCH] video: backlight: adp8870: Fix warn_unused_result warning reported by Stephen Rothwell

[michael.hennerich]

From: Michael Hennerich <michael.hennerich@xxxxxxxxxx>

handle return value, strict_strtoul is declared with attribute warn_unused_result

Signed-off-by: Michael Hennerich <michael.hennerich@xxxxxxxxxx>
---
 drivers/video/backlight/adp8860_bl.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/drivers/video/backlight/adp8860_bl.c b/drivers/video/backlight/adp8860_bl.c
index 3ec2460..8746303 100644
--- a/drivers/video/backlight/adp8860_bl.c
+++ b/drivers/video/backlight/adp8860_bl.c
@@ -502,8 +502,10 @@ static ssize_t adp8860_bl_l1_daylight_max_store(struct device *dev,
 		struct device_attribute *attr, const char *buf, size_t count)
 {
 	struct adp8860_bl *data = dev_get_drvdata(dev);
+	int ret = strict_strtoul(buf, 10, &data->cached_daylight_max);
+	if (ret)
+		return ret;
 
-	strict_strtoul(buf, 10, &data->cached_daylight_max);
 	return adp8860_store(dev, buf, count, ADP8860_BLMX1);
 }
 static DEVICE_ATTR(l1_daylight_max, 0664, adp8860_bl_l1_daylight_max_show,
-- 
1.6.0.2

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