backlight: initialize struct backlight_properties properly

In all these files, the .power field was never correctly initialized.

Signed-off-by: Corentin Chary <corentin.chary@gmail.com>
Cc: Jingoo Han <jg1.han@samsung.com>
Cc: Dave Airlie <airlied@gmail.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>

drivers/platform/x86/toshiba_acpi.c

@@ -1104,6 +1104,7 @@ static int __devinit toshiba_acpi_add(struct acpi_device *acpi_dev)
 
 	mutex_init(&dev->mutex);
 
+	memset(&props, 0, sizeof(props));
 	props.type = BACKLIGHT_PLATFORM;
 	props.max_brightness = HCI_LCD_BRIGHTNESS_LEVELS - 1;
 	dev->backlight_dev = backlight_device_register("toshiba",