platform/x86: compal-laptop: Use backlight helper

Instead of manually checking the power state in struct
backlight_properties, use backlight_is_blank().
Signed-off-by: Stephen Kitt <steve@sk2.org>
Cc: Cezary Jackiewicz <cezary.jackiewicz@gmail.com>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Mark Gross <markgross@kernel.org>
Cc: platform-driver-x86@vger.kernel.org
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Link: https://lore.kernel.org/r/20220607184635.1127913-4-steve@sk2.orgReviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

drivers/platform/x86/compal-laptop.c

@@ -324,9 +324,7 @@ static int bl_update_status(struct backlight_device *b)
 	if (ret)
 		return ret;
 
-	set_backlight_state((b->props.power == FB_BLANK_UNBLANK)
-		&&    !(b->props.state & BL_CORE_SUSPENDED)
-		&&    !(b->props.state & BL_CORE_FBBLANK));
+	set_backlight_state(!backlight_is_blank(b));
 	return 0;
 }