ACPI / video: remove unnecessary type casting

Remove type casting from assignments involving void pointers
in two places in drivers/acpi/video.c.

[rjw: Changelog]
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Reviewed-by: Aaron Lu <aaron.lu@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index fff5bb3..8681727 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -236,8 +236,7 @@
 {
 	unsigned long long cur_level;
 	int i;
-	struct acpi_video_device *vd =
-		(struct acpi_video_device *)bl_get_data(bd);
+	struct acpi_video_device *vd = bl_get_data(bd);
 
 	if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
 		return -EINVAL;
@@ -255,8 +254,7 @@
 static int acpi_video_set_brightness(struct backlight_device *bd)
 {
 	int request_level = bd->props.brightness + 2;
-	struct acpi_video_device *vd =
-		(struct acpi_video_device *)bl_get_data(bd);
+	struct acpi_video_device *vd = bl_get_data(bd);
 
 	return acpi_video_device_lcd_set_level(vd,
 				vd->brightness->levels[request_level]);