Revert "dm verity: correcting logic used with corrupted_errs counter"

This reverts commit b649934e.

Based on the upstream review comments its not advised to
ignore the block error and continue so reverting this .

Change-Id: Icf18bd5bdba96b396eee3ddff7e6d39a9bed5816
Signed-off-by: Ravi Kumar Siddojigari <rsiddoji@codeaurora.org>