fbdev: ssd1307fb: Remove struct backlight_ops.check_fb

The driver sets struct fb_info.bl_dev to the correct backlight
device. Thus rely on the backlight core code to match backlight
and framebuffer devices, and remove the extra check_fb function
from struct backlight_ops.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://lore.kernel.org/r/20240305162425.23845-10-tzimmermann@suse.deSigned-off-by: Lee Jones <lee@kernel.org>

drivers/video/fbdev/ssd1307fb.c

@@ -530,17 +530,10 @@ static int ssd1307fb_get_brightness(struct backlight_device *bdev)
 	return par->contrast;
 }
 
-static int ssd1307fb_check_fb(struct backlight_device *bdev,
-				   struct fb_info *info)
-{
-	return (info->bl_dev == bdev);
-}
-
 static const struct backlight_ops ssd1307fb_bl_ops = {
 	.options	= BL_CORE_SUSPENDRESUME,
 	.update_status	= ssd1307fb_update_bl,
 	.get_brightness	= ssd1307fb_get_brightness,
-	.check_fb	= ssd1307fb_check_fb,
 };
 
 static struct ssd1307fb_deviceinfo ssd1307fb_ssd1305_deviceinfo = {