This patch fixes the checkpatch warning as below:
  WARNING: quoted string split across lines
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
        data->current_brightness = value;
        return 0;
 out:
-       dev_dbg(chip->dev, "set brightness %d failure with return "
-               "value:%d\n", value, ret);
+       dev_dbg(chip->dev, "set brightness %d failure with return value: %d\n",
+               value, ret);
        return ret;
 }