block: Fix bad range check in bio_sector_offset

DM would occasionally end up splitting data integrity-enabled requests
incorrectly. The culprit was a bad range check in bio_sector_offset.

Change-Id: If1845750a6dfc92646ed0b817ed253f4eb8dcb30
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
fat: simplify writeback_inode function

Simplify writeback_inode function.

Change-Id: Id08776158566e26c150899752f368bf7a83b8237
Signed-off-by: Namjae Jeon <linkinjeon@gmail.com>
Signed-off-by: Amit Sahrawat <amit.sahrawat83@gmail.com>
Acked-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>