dm integrity: Remove bi_sector that's only used by commented debug code

dm integrity: Remove bi_sector that's only used by commented debug code

[ Upstream commit 5cd6d1d53a1f74222e73d8b42ab7ecf28ee2f34f ]

drivers/md/dm-integrity.c:1738:13: warning: variable 'bi_sector' set but not used.

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Link: https://bugzilla.openanolis.cn/show_bug.cgi?id=3895
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Stable-dep-of: f7b58a69fad9 ("dm: fix improper splitting for abnormal bios")
Signed-off-by: Sasha Levin <sashal@kernel.org>