verity: use block instead of block_index everywhere

This makes our use block consistent. block is also easier to type than
block_index.

BUG=chromium-os:9752
TEST=Ran dm-verity.git unit tests. Ran platform_DMVerityCorruption on H/W.

Signed-off-by: Mandeep Singh Baines <msb@chromium.org>
kernel.git Reviewed-on: http://gerrit.chromium.org/gerrit/4453

Code has already been reviewed and committed to kernel.git.

Change-Id: Ia24f93cf9d7b318dbbe71732116088f012fafee6
Signed-off-by: Mandeep Singh Baines <msb@chromium.org>
Reviewed-on: http://gerrit.chromium.org/gerrit/6775
2 files changed