ext4: make state in ext4_mb_mark_bb to be bool

As state could only be either 0 or 1, just make it bool.

Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Reviewed-by: "Ritesh Harjani (IBM)" <ritesh.list@gmail.com>
Link: https://lore.kernel.org/r/20230928160407.142069-2-shikemeng@huaweicloud.com


Signed-off-by: Theodore Ts'o <tytso@mit.edu>