[PATCH] backlight: lm3509_bl: Fix NULL vs IS_ERR() check in register() function

[Dan Carpenter]

The devm_backlight_device_register() doesn't return NULL, it returns
error pointers.  Update the error checking to match.

Fixes: b72755f5b577 ("backlight: Add new lm3509 backlight driver")
Signed-off-by: Dan Carpenter <dan.carpen...@linaro.org>
---
 drivers/video/backlight/lm3509_bl.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/video/backlight/lm3509_bl.c 
b/drivers/video/backlight/lm3509_bl.c
index ab57f79ffe23..c93cdedff5ad 100644
--- a/drivers/video/backlight/lm3509_bl.c
+++ b/drivers/video/backlight/lm3509_bl.c
@@ -114,9 +114,10 @@ lm3509_backlight_register(struct device *dev, const char 
*name_suffix,
        }
 
        bd = devm_backlight_device_register(dev, label, dev, data, ops, &props);
-       if (bd)
-               backlight_update_status(bd);
+       if (IS_ERR(bd))
+               return bd;
 
+       backlight_update_status(bd);
        return bd;
 }
 
-- 
2.43.0