md/raid5: check before referencing mddev->bitmap_ops

Prepare to introduce CONFIG_MD_BITMAP.

Link: https://lore.kernel.org/linux-raid/20250707012711.376844-13-yukuai1@huaweicloud.com
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Xiao Ni <xni@redhat.com>
This commit is contained in:
Yu Kuai 2025-07-07 09:27:08 +08:00
commit bb9317b13a