LU-13197 e2fsck: use proper types for variables

LU-13197 e2fsck: use proper types for variables

Use ext2_ino_t instead of ino_t for referencing inode numbers.
Use loff_t for offsets instead of off_t to avoid 32-bit overflow.
Use unsigned int for flags so that they are not negative numbers.

Cast int products to ssize_t before multiplication to avoid overflow.

Signed-off-by: Andreas Dilger <adilger@dilger.ca>
Change-Id: Iaeaea8cb8b38902aefd1f4e9919d17fbe23ebbe5
Reviewed-on: https://review.whamcloud.com/37424
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Li Dongyang <dongyangli@ddn.com>
Reviewed-by: Wang Shilong <wshilong@ddn.com>