misc: replace strict_strtoul() with kstrtoul()

The usage of strict_strtoul() is not preferred, because
strict_strtoul() is obsolete. Thus, kstrtoul() should be
used.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/misc/carma/carma-fpga.c b/drivers/misc/carma/carma-fpga.c
index a2128af..7b56563f 100644
--- a/drivers/misc/carma/carma-fpga.c
+++ b/drivers/misc/carma/carma-fpga.c
@@ -1002,10 +1002,10 @@
 	unsigned long enable;
 	int ret;
 
-	ret = strict_strtoul(buf, 0, &enable);
+	ret = kstrtoul(buf, 0, &enable);
 	if (ret) {
 		dev_err(priv->dev, "unable to parse enable input\n");
-		return -EINVAL;
+		return ret;
 	}
 
 	/* protect against concurrent enable/disable */