[PATCH] backlight, panasonic-laptop: fix incomplete registration failure handling

["Bruno Prémont" <bonbons@linux-vserver.org>]

Properly return backlight registration error to parent.
Mark struct backlight_ops as const.

Signed-off-by: Bruno Prémont <bonbons@linux-vserver.org>
Acked-by: Harald Welte <laforge@gnumonks.org> (registration failure)
---
 drivers/platform/x86/panasonic-laptop.c |    4 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/x86/panasonic-laptop.c b/drivers/platform/x86/panasonic-laptop.c
index 9012d8d..9b17343 100644
--- a/drivers/platform/x86/panasonic-laptop.c
+++ b/drivers/platform/x86/panasonic-laptop.c
@@ -352,7 +352,7 @@ static int bl_set_status(struct backlight_device *bd)
 	return acpi_pcc_write_sset(pcc, SINF_DC_CUR_BRIGHT, bright);
 }
 
-static struct backlight_ops pcc_backlight_ops = {
+static const struct backlight_ops pcc_backlight_ops = {
 	.get_brightness	= bl_get,
 	.update_status	= bl_set_status,
 };
@@ -644,8 +644,10 @@ static int acpi_pcc_hotkey_add(struct acpi_device *device)
 	/* initialize backlight */
 	pcc->backlight = backlight_device_register("panasonic", NULL, pcc,
 						   &pcc_backlight_ops);
-	if (IS_ERR(pcc->backlight))
+	if (IS_ERR(pcc->backlight)) {
+		result = PTR_ERR(pcc->backlight);
 		goto out_input;
+	}
 
 	if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf)) {
 		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
-- 
1.6.4.4